I bought a GM 2001 4.3L v6 engine block with a damaged intake manifold, it had a hole. The part number on the lower part of it was 25176554. I found something that looks similar on ebay, it is an intake manifold for Chevy S10 Blazer 1998, with the part number 17090544, for the same engine 4.3L v6. I cannot find anywhere if these intake manifolds are compatible, at least lower units, since I can replace the upper unit with the original one. Any help would be greatly appreciated. Thx.