Exhaust manifold part numbers

[MLB]

Hi everyone, I came across this forum and thought it a good idea to register. I'm just staring to work on doing some restoration to a 69 C10 1/2 ton, 307 C.I., short bed. I've had to replace my exhaust manifold gaskets multiple times over the years as they always seem to burn through and start leaking. I'd like to replace both exhaust manifolds and am having difficulty being positive on the part numbers for both the passenger and driver side manifolds. Can someone please help me verify the part numbers I need. The two part numbers I think I need are: 3932469 (driver) and 3905364 (passenger), but I'm not positive and I need an expert to help me verify this and possibly a reliable source for dependable exhaust manifold replacements. Thank you mates ! Mo