MK 111 switch gear threadings.

R.H. switch and throttle housing screws ( on my 76) were a bit buggered on the heads , so decided to pull them and possibly replace with those from my other 75 bike. No chance of those fitting or working out. Different sizes for sure. My real goal is to replace the screws on both bikes with Allen head ones (stainless if possible) on both sides of both bikes. Any help appreciated. My notes say :
M5 x 32 mm
M5 x 44 mm
M5 x 25 mm
M4 x 22 mm
Clearly the 75 and 76 models are different thread sizes for switch gear screws. A surprise for me.