I could not find the snap-on screwdriver set either.. less than a year or two ago they still had them available, because I priced a set off the truck. With luck your dealer can look and see if there is a set sitting in stock somewhere else and get them for you.
Snap-On does offer these:
http://buy1.snapon.com/catalog/tools.asp?tool=all&Group_ID=161&store=snapon-store

Few months ago I found a really old Snap-On set at a swap meet, from the 30's I am told.
Keep your eyes open, you'll find some.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-