See also 86-90 Oil Pump (26204-86) Individual Parts and Pics
Note: All dims are taken from a used pump (unless otherwise noted) and should be viewed as approximate measurements only.
The only intent is to show general measurements for comparison. 1)
The same gear shaft part number (26488-75) was used from 77-90.
The teeth pitch are all the same on the gear.
Gear shaft pin (26430-76)
These can have slight differences in length also.
Different pins were mic'd and the dims noted as below: