Exhaust Manifold Casting Numbers

I'm trying to get some new exhaust manifolds as mine look like they have been on the bottom of the ocean for 20 years. I can't seem to be able to find out what part or casting numbers will work(I need both sides). I have a '89 4.3 4X4 auto. If someone knows what numbers are correct I would appreciate the help.

any through 94 will work.... But at that point why waste money on stock manifolds, grab yourself some edlebrock headers instead...

I really need the part and/or casting numbers because I'm dealing with a guy who only knows them and not the years of models they fit. I'm getting a really good deal on them or I would buy the Edelbrock TES System.

Thanks