Also called a pumpkin, 3.00:1 open ratio. 1967 9 inch third members did not originally come with fill plugs. The back of the housing had the oil fill plug. You can mix and match 9 inch assemblies from 1967-1970, just make sure that you have at least one fill plug. 28 splined axle.
Check your door tag under "Axle".
1967 code 1