Converting to a 5 lug pattern is not too difficult. My rear hubs are from a Porsche 996 and although it had 5 lugs, they were metric and the bolt pattern was 130mm. Only Porsche racing wheels would fit and they were not available in a decent selection of rim widths and back spacing choices, as well as being $$$.
I had the hubs drilled for five 5/8" UNC studs on a 5" diameter bolt circle. This way I could use circle track wheels- cheap and available in many sizes. QED.
Regards, Neil Tucson, AZ