That serial number is for an MC-1 drive, but here's the 'hook'. The serial number is on the top (drive shaft) housing, and the lower (gear) housing could have been changed. You need to take the drive apart to see exactly what you have...
What you're looking for....
Does the lower drive shaft have a 'pre-load' pin at the top?
If not, it's an MR or Alpha One gear housing, and requires a 46-96148A8 kit for the housing and impeller and a 46-44292A3 base.
If it has a pre-load pin, you have an MC1 or R gear housing and require the same top kit (46-96148A8) but either a base with a 'flush' hole or without. With the flush hole (for early MC-1) is 46-48748T1 base, without is a 46-57234T1 base.
Hope this helps,
Chris............
