|There were different numbers for early K-models, but by the time 1958 rolled around, the second year of the Sportster, this shaft has stayed the same.
Note the BOM table in the countershaft sub-assembly page.
The -52 is for 1952 and 1953, the -54 is 1954 to 1957 and the dash 58 is 1958 and later.
This page will be updated later with what to look for as this part wears or fails.
The left countershaft has a spiral gear as part of the low or 1st gear.
It drives the speedometer on 1952 to 1972 models. The right countershaft
is what would be used on 1973 to 1984 Iron Sportsters, the speedo is
from the front wheel.