The Vintage Venom kit is designed for drum brake cars. So for Merv's GT with its front disc brakes, we needed to acquire a new pair of drum brake hubs, making sure they didn't have counter-sunk holes on the inboard side. If you're replacing drum brakes, then you'll need to separate the hub from the drum, which can be done by carefully tapping on the studs. Whether you're using a new hub or the existing hub, the lug holes must be carefully opened up to 0.620 inch (approximately 0.010 inch larger) to accommodate the longer ARP studs, which are supplied in the Vintage Venom kit. Unless you're experienced, you may want to have the holes enlarged and the studs pressed in by a local machine shop.