Rocker Cover Screw Size

I found a couple of threads relating to this but no-one actually specified the size unfortunately.

I'm looking at (When I find some of the damn things, anyone selling any?) dropping some 1.3 cams in, however I don't like the look of those rocker cover screws. I'd like to replace them with proper bolts however I don't know what the thread size is. Does anyone know?
 
http://www.ebay.co.uk/itm/231005146194?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

$T2eC16J,!zQE9s3sq+uwBR)uECh4Vg~~60_12.JPG
 
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