Head studs help!

[t24ticLT28]

hello .
i have 2x d24tic with head's off . i am making one good one , it will be going in a vw lt 25 westy. i hope to do some small mods and up boost a little . should i do head studs ? both are 1995 ish but have 11mm studs ? is this the normal ? i cant seam to find the right arp stud ! dose any one have a part number ? cheers for you help