Probably M8x1.25 did somebody break them ?

 

I had a dash out on the weekend...

The blue circled one is M6 from memory - it's a 10mm socket head, and goes into the air conditioning evaporator box to hold it in - it doesn't hold the dash to the vehicle.

The big one underneath holds the bottom of the dash frame to the bodywork, and isn't a bolt, but a stud that is threaded into the bodywork (I presume there's a captive nut welded in there). It's a 13mm socket on the nut, so as pwood999 mentions, it's most likely an M8.

The dash frame is also held in at the top, and is bolted through the firewall and comes out somewhere under the plenum covers at the bottom of the windscreen (if you are trying to remove the whole frame)