1970 c20 l9h 6l90e

[1970C20L9H]

I got the part numbers, They were listed on the instructions that came with the manifolds.

Exhaust manifold to cylinder head gasket part # 12617944
Exhaust manifold to cylinder head bolts part # 11518860 or 11547135
Exhaust manifold outlet seal part # 92202326
Exhaust manifold outlet studs 10mmx1.5 part # 11589264
Exhaust manifold stud nuts 10mmx1.5 part # 15032594

All together about $155 from gmpartsdirect but I already have the manifold head bolts so about $120