Dave:

I just posted about the engine in your Super 99.  Although many people refer to Oliver 6 cylinders as Waukesha engines they really are not.  They were designed by Oliver and used by Oliver.  Waukesha was the company that assembled them for Oliver, but they were not considered by the company to be Waukesha engines like others that they made.  As far as I know no one other than Oliver/White used the 6 cylinders gas or diesel that were assembled by Waukesha.

The big thing about getting parts for your tractor is to make sure that whoever you are dealing with knows it is a 6 cylinder diesel.  There were more Super 99s made with the GM diesel than the 6 cylinder, I don't know how many, but most people when they think of Super 99s think of it with the GM engine.

Congratulations on getting an Oliver,  I hope you enjoy it for a long time to come.

Bill Brandt