drum to disc O.E issue

well considering the only wheel id move to is a rally....ya i can guesstimate quite a lot. maybe not $2k but more than i want. and whats 8 1/4 about? im trying to get my hands on an 8 3/4 but im doin drums in the back anyway.

so what would i need to look into to find 10" spindles sbp then? 73+ is lbp, if im reading this correctly, so would i want to look for 67-72 spindles? are there repops or 10" spindles?