We want to run same PCD wheels front and rear so had the front hubs (Volvo are 5 on 108mm) redrilled for Ford 5 on 4.5 inch (114.3mm). The Volvo wheel studs are someting like 14m diameter at the shoulder and narrow down to normal size for the threaded section so going to smaller shoulder ARP studs bought enough room to redrill and the disc goes over the top of the hub for added security.
Picked up the 9 inch during the week. New housing with billet bearing housings, Strange axles and ARP studs. Will need to shorten about an inch each side but plenty of spline lenght to accomodate this.