Reservoir Cap Screw Size KZ1100 A3 1983

Hi, mates. Could anyone tell me what the exact metric size of the screw is for the front master cylinder reservoir cap?
KZ1100 A3 1983 - Part nr. (92001-1055)
Is it M5x12mm or M5x16mm? (what's the diameter, pitch and length) ?

Since the OEM is quite expensive, I wanted to get the screws from local hardware store.

Thanks
jeh

The right m5x12 screws are still available OEM for a few bucks. I'm all for saving money but these aren't expensive. Cheap screws will probably rust and seize in

 

I replace them with with stainless steel M5x12 countersink screws. With a little dab of anti-seize they always come back out.