question sort of related

im planning on eventually getting into ita, i drive an 89 s13 that already has an r32 skyline gts rear end (4.36 gear) with an s15 hlsd

the rule for rear ends says it must fit in the stock diff/housing/etc without modification

would the r32 diff be illegal? its an r200 like the stock one, it does have the 5 bolt halfshafts instead of the 3x2 of the stock, but thats the only difference iirc, aside obviously from the gear

so would i need to transfer the gear and the lsd back to the stock diff and lose the $250 i payed for my skyline diff or would it probably be ok to use the skyline diff