Bill, Just food for thought......
If the seat is in good nick, why not try centre-popping the broken studs, drill, soak with a penetrating oil and use an "Easy-Out"....Once the oil has had time to soak right in, they sometimes remove quite easily..... Might save you the price of a new seat. wink
Regards, Darryl

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin