Have a Pre Mod 34 that's missing the larger upper side plate (Bug)screw.

Are these all the same size between I and K frames? Found a replacement but it's listed as a K frame.

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SWCA #3356, SWHF#611

To the best of my knowledge yes. Of course, the lower screw in front, above the trigger was fitted (basically trimmed to length) to hold the crane in, but it was still the same screw.

Oh, and the hidden screw was a flat head, the others rounded, but even those I thought would interchange.

Someone with more knowledge will undoubtedly give us the final word.

Oh never mind, you mean the 5th screw! That I'm not entirely sure about.

Yep. The bigger one on the top. (5 screw gun)

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SWCA #3356, SWHF#611

If you use a K or N frame large head sideplate screw, it will work but you'll have to shorten it a bit. If not, it will prevent the hammer from reaching the cartridge since they are longer and the hole is bored all the way through.

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Chris
SWCA #2243 SWHF #292

The threads are different between the pre war and post war screws.

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John 3:16
WAR EAGLE!