Are they the older style 2 prong style ones or the newer mcguard ones which have the design on them?
The older ones will come iff easily with a multihex socket hammered on or the ones linked above
If its the newer mcguard ones they have a collar on them which spins if you put a socket on.
Either need to hammer the collar off which is a pain to do. Or weld a nut on. Or send off a wax print to mcguard who will be able to send you a new key at cost to you.. or find a dealer which still has a master set(we have one but rather far away. Or dynomac locking wheel nut remover set which sometimes works. Tbh 10 a corner for mcguards sounds about right
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