Originally Posted by Touring Car Spares

thats not strictly true , the wheel above is a GpA wheel with a steel tube insert, like Jimbos Dads car above , the wheel nuts in this photo are convertor nuts so you can use these wheels on regular studs, proper GpA wheel nuts are only a small nut ( as per Jimbos pic )the wheel is located by the shoulder and the nut holds it on , these come in many sizes and materials and are a M14 thread in 2 pitches , you cant confuse these for regular nuts .