PM Wasso, he makes his own kits and sells to members. He actually sells the whole kit, spacer and all and it would have been better than the skunk one, but maybe he has a few spare plastic spacer laying around that you could get. Failing that, I'm sure he will be happy to give you the parts list.
I think the central plenum bolts you need are 4x M6x75mm, 3x M6x65 and then about 10-12x M6x35mm.