Yes, Roscoe is right i believe... the extra "oil cooler" bit is only on the "F"....
Since you have the whole set up, it might fit? Try it? Or not?
From Hondachopper.com
CB750E-2600014 and CB750GE-1000014
F2
New cylinder head with bigger valves (34/31mm i/o 32/28mm), larger combustion chamber, larger carb mount rubbers, stronger cam chain, new camshaft, harder valve springs, new retainers, cotters, new pistons compression ratio 9/1. New rod big end bolts and bearings, harder clutch springs, additional fins on crankcase, larger fins on oil pan, "oil cooler" - finned plate between oil filter case and engine. Final drive 15/43 or 14/43.
Cheers, Phil