Screw Caps on HGA

Hey, Does anybody know where I can buy the 4 socket screw caps that go on the HGA? I live in the UK & although I have found them on the internet to buy I’m not sure about the size etc?? Thanks

The socket head cap screw size is 1/4-20 NC. The head diameter is .374 (9.5mm) and the head height is .252 (6.39mm). I don’t have one to measure, but I think a 6x1mm metric screw would probably come close !

Hope this helps.

Mark