Iron Sportster bill of material
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The detailed BOM (bill-of-materials) starts here:Top-level BOM

The table below is a very rough overview. As the detailed sections get completed, there will be links added to the table below. Iron-Sportster-BOM.pdf
Major components. many variations within one type, see detailed BOM for part numbers.
(Revision 5)
Year 1952 K 1953 K 1954 K 1955 K 1956 K 1957 XL 1958 XL 1959 XL 1960 XL 1961 XL 1962 XL 1963 XL 1964 XL 1965 XL 1966 XL 1967 XL 1968 XL 1969 XL 1970 XL 1971 XL 1972 XL 1973 XL 1974 XL 1975 XL 1976 XL 1977 XL 1978 XL 1977 XLCR 1979 XL 1980 XL 1981 XL 1982 XL 1983 XL 1984 XL 1983/4 XR-1000 Year
Engine 740cc 45cid flat head no trap door 900cc 55cid flat head 900cc 55cid OHV 900cc 55cid OHV elect start 1000cc 61cid OHV, electric start except XLCH models.
1972 1-year-only heads and cylinders.
1974 speedo drive from tranny to front wheel.
1977 major case change,
1981 electric starter mounting changed, no kickstarter possible.
1985 not shown since alternator is behind clutch.
1000cc 61cid OHV elect start alum heads Engine
Engine XLCH NA Same case 900cc 55cid OHV  Same case, no elect Engine XLCH
Front Brake Side drum Hub drum Bana disk single disk Dual disk rattler modern single disk Front brake
Rear Brake Drum rod Drum cable Disk rattler Disk modern Rear brake
Shifter Right side Left side kludge Left side Shifter
Frame Cast joints, no dent in under side of top tube Cast joints, dent in under side of top tube Cast joints, dent in under side of top tube, angled rear tubes  Welded joints, dent in under side of top tube, angled rear tubes Triangle Modern loop Frame
Gear case Mount distrib and magneto Cone, old pinion shaft Cone, new pinion shaft Gear case
Primary Single rib aluminum Sportster logo XLH, Tin XLCH 1958-1969 Hump aluminum (other than 67-69 XLCH) Hump aluminum new case Primary
Gen 6-volt 12V Prestolite 12-volt Hitachi Gen
Starter NA Prestolite Hitachi Back to Prestolite Nippon denso planetary Starter
Gas XLH Large flat- bottom Large dented bottom Turtle Peanut CR tank Peanut new mount Peanut yet a new mount Peanut, yet a different  mount Gas Tank
Gas XLCH NA Peanut NA XLS:Large maybe gage XLS: rubber mount XLS:
Dash
NA Gas XLCH
Front fender Struts, rear flair Struts, no flair Valenced Struts, no flair  Top mount, braces; 1983 XLXTop mount one off 59031 -83 Top mount 59007-84 Front fender
Front fender XLCH NA Struts, no flair  Front fender XLCH
Year 1952 K 1953 K 1954 K 1955 K 1956 K 1957 XL 1958 XL 1959 XL 1960 XL 1961 XL 1962 XL 1963 XL 1964 XL 1965 XL 1966 XL 1967 XL 1968 XL 1969 XL 1970 XL 1971 XL 1972 XL 1973 XL 1974 XL 1975 XL 1976 XL 1977 XL 1978 XL 1977 XLCR 1979 XL 1980 XL 1981 XL 1982 XL 1983 XL 1984 XL 1983/4 XR-1000 Year
Oil tank  K, XLH Kidney Triangle Loop Oil tank  K, XLH
oil tank XLCH NA Horse shoe Lunch box oil tank
Battery 6V Two 6V 12V H12 28AH 28AH YB16-B fact 65991 -75C YB16-B
fact
65991- 82A
Battery
Battery XLCH none 12V 7AH Battery XLCH
Tail lamp Hood Hole in fender, two lenses One piece lens Tail lamp
Rear shocks Early middle Showa 12.7 13.5 opt 12.5 late Rear shocks
Exhaust Single, separate front and rear pipes Single comb front and rear pipes Inter connected duals, short mufflers, high pupe XLCH  1959 Staggered duals, many others fit or were optional integrated qiet Staggered duals Staggered dual with crossover Single muffler Dual both sides will fit  54-78 staggered duals new mount left side Exhaust
Head lamp Bottom mount Eye brow XLCH, New bot mount XLH with nacelle Eye brow Head lamp
Clutch Dry Wet, 1980 and later has diff ring gear Clutch
Kick starter Yes No Kick starter
Carb Linkert L-carb Tillotson Bendix Keihin butterfly del orto dual Carb
Front end Cow bell Gator, axle fender mount Top mount fender Kaya Showa single disk Showa dual disk Modern single disk Front end
Trans mission 4-spped crash box Trans mission
Year 1952 K 1953 K 1954 K 1955 K 1956 K 1957 XL 1958 XL 1959 XL 1960 XL 1961 XL 1962 XL 1963 XL 1964 XL 1965 XL 1966 XL 1967 XL 1968 XL 1969 XL 1970 XL 1971 XL 1972 XL 1973 XL 1974 XL 1975 XL 1976 XL 1977 XL 1978 XL 1977 XLCR 1979 XL 1980 XL 1981 XL 1982 XL 1983 XL 1984 XL 1983 XR-1000 Year

What this BOM is about:

The sub-assemblies at the right can help you navigate to what parts you are interested in.