[twack]

you could get a set with custom sizes, or you could just order from a different car that has the sizes you like.

but i think your overthinkning this issue. check your coil pack for arcing and multimeter it, then check your wires, and see if they are arcing on the spark plug cover where you drilled through it, they may be rubbing. You arnt still using those iridiums that you had at my house are you? and for good times sake, do a boost leak test!