know anyone with Boyd Junk Yard Dog Rims that can answer a question?

[UK 58 apache]

Hi Guys,
I've got a 58 apache but its got a C10 front clip on it, i don't know what year unfortunately, but i want to fit a set of junk yard dog boyds on it , my only concern is the depth of the center bore hole, as the center of the disc where the outer bearing is , looks quite long?
Just wondering if anyone has, or knows anyone thats fitted a set of JYD rims with no problems to a C10?

It would be great to get this measurenment

I did email sumit but they were as helpful as a chocolate spanner.
I've emailed the manufactures but not heard anything yet,

many thanks
karl