ey can actually be trickier to find than you think. HeliCoil only has Advance Auto as a liscensed distributor. That's where I found them. As soon as I get a chance to measure the head studs, I'll run down there and pick up a set.
But hey, if you need a helicoil to fix a stripped head stud socket (in the block itself), I can send you my set after I use it for my engine (the kit comes with like 12 inserts) and we can split the cost. The kits are around $40 each.