I have the numbers for the Blaster steering system in the TechFAQ, in the reference library.
Not sure if they are the same, but might be worth a look.
Since the old bearings are trashed, I would protect the steering and use a hammer and chisel (or screwdriver) to knock out the old bearings (since they are garbage).
I would start by removing the center/steering shaft.
HILL INDUSTRIAL SUPPLY, INC.
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Subject: (2) SSR12-2RS PREMIUM bearings
Note:Here is your invoice for (2) SSR12-2RS PREMIUM bearings, including shipping and handling. Thanks, Bob
Ultra-Hard Wear-Resistant Stainless Steel (Type 440C)
When heat treated, one of the hardest stainless steels. High carbon content provides good wear resistance. Magnetic. Ideal for bearings, valve parts, and knife blades. Temperature range not rated.