Let me check if I can find the Typhoon part #, actually you should get this at several online stores and even at pep-boys (no need to spend the $$$ for the GM part).
For NON-specific Sy parts parts you can order a free catalog from LMC Truck. Cheap pricing and shipping. Have ordered a few things from and all went smooth.
They don't offer a catalog for our year blazer body style yet, I have ordered from the S-10 catalog, only parts I knew would work with Ty also.