Thanks hcarter and Waldig,

I'm gonna get home, pop off one if my existing bolts and check the protrusion on the new wheel. So from my understanding of what you say Waldig; the rear hub can accomodate 19-20mm of thread from the lug without causing any problems?

If so then I need a lug that has 35mm protrusion through my new wheels to be able to accomodate a 15mm spacer and not damage my e/brake.

I feel less confused, but that doesn't mean I am!