6mm for the left side, 5mm for the right.
And, since the correct size is very important (to prevent wobble), the holes should be drilled undersize, then reamed with a carbide reamer.
Note that 6mm is also the correct size to ream the trigger and disconnector if you want to use one of those anti-pin-rotation sleeves (the little tube near the center of the image):
I have these in all my Kalashnikov rifles. Keeping the spring tension off the axis pin itself prevents the pin from rotating and makes the trigger pull MUCH smoother and a little lighter.
(My trigger groups are the ones that Red Star Arms sells... and the steel is VERY hard... necessitating the use of a carbide drill and reamer... even a titanium nitride drill gets chewed up trying to enlarge one hole).
On another note... interestingly my 2001 SAR1 was built with a "genuine" Romanian semi-auto receiver. Supposedly the Romanian military issues semi-auto AK rifles to new soldiers and full auto afterwards, and my receiver has a "Y" shaped indentation where the "evil third pin" goes, but there's no hole there... only the indent.
(click pics for hi-res)
OH NO!!!!!! MY SAFETY LEVER GOES UP!!! MAYBE I SHOULD JOIN THE LAWSUIT???
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