Thanks for the replies.
The reason I ask is... I'm going to replace my entire clutch hydraulic system this spring.
People were having a very hard time finding the original GM slave (# 10038878) 4 years ago, so finding one now is impossible.
I was going to rebuild my orig slave because it's still in pretty good shape with 50k, and rather do that then use the aftermarket slave. (GM # 18030137, Autozone, PepBoys, Advance, NAPA, etc... all the same)
So just for kicks I ran the 2 part numbers on the GM Parts Locator.....
- Obviously the GM replacement one (# 18030137 = aftermarket slave in GM box) is plentlyful.
- But to my suprise the original GM slave (# 10038878) kicked back ONE result.
I was shocked.
It was located in NY at a SAAB dealer and called them yesterday. He put me on hold (which seemed like forever) while he checked for the part. He came back to the phone with a "Yes... I have it" 
I asked him to describe the part. He said "Well... it's got a lot of dust on the box so it's been here a while" I asked him if it was a bare cast iron finish. <*opens box*> "No... It's a smooth black steel finish in a sealed bag" 
Did I really find an original slave after all these years? Is it possible that part was hidden on the shelve and recently uploaded into their inventory when they cleaned house to be found on the parts locator?
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Profile? In 20 years... Auto Detailing, Auto Body, Classic & Antique Restorations, Mechanic, Engine Performance Specialist, Porsche-Jaguar Tech, Wholesaler, Sales, Independent Full Service Repair Shop, Vehicle Vinyl Graphic Design and hard-core auto / aviation enthusiast... now searching for a new career. What a ride![This message has been edited by Skybax (edited 02-09-2005).]