s-13 hicas rear 5-lug?

[racepar1]

We are trying to take my buddy's hicas car back to stock and ran into a little problem. The car was converted to 5-lug by the previous owner and when I went to put 4-lug hubs back on the rear I noticed that the stock hubs that I have won't work. It looks to have a set of hicas z-32 rear uprights/spindles and the 5-lug hubs are not removable from the spindles. They are not bolted in with 4 bolts like the s-13 hubs that I have seen. The bearings are pressed into the spindles/uprights and the hubs are pressed into the bearings. Are OE s-13 hicas rear spindles like that? Or do they have removable hubs just like the non-hicas rear uprights? We're trying to figure out what we have to do to take it back to stock and I have not worked on very many hicas cars before so I don't know for sure how the rear hubs are attached stock. Anybody have experience converting the rear of a hicas s-13 to 5-lug? Your help would be much appreciated, thanks.