Missing parts/radiator size

[Bigboom997]

Hey guys I have a 1990 GMT 400 and I was wondering if anyone could help me find out what size radiator I need. Also I'm missing a part here and I don't know what it is. Can someone help me find out what goes here?

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[PlayingWithTBI]

Hey guys I have a 1990 GMT 400 and I was wondering if anyone could help me find out what size radiator I need.

If it's a 5.7 and doesn't have the towing package, it's probably a 28" X 17" core.

Also I'm missing a part here and I don't know what it is. Can someone help me find out what goes here?

That looks like where your A.I.R. (smog) pump goes.