Skiddus, were they ok I take it?http://www.trackstore.co.uk/shop frame.html
You want the Vauxhall SS39-63mm ones and nuts with 60 degree seat.
Just ordered mine-20 studs,20 nuts a set of lock nuts and carriage came to £59.50.I ordered extra nuts and studs because they're handy to have if you snap/lose one.