Did the lock look like the picture I posted? If so, what is behind the locking cap? Did you drill into the keyhole?

Thank you!

Not sure how that one works, but probably the nut turn on the outside, and when key is used it allows the nut to loosen to remove. Drill into the key hole, and remove the guts. You should be able to then see how to turn the stud to remove it from the wheel. They are aluminum wheels, so be extra careful about getting to wrathy on man handling it so as not to damage the stud opening. 

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Ok, thank you!

Assuming that the lug cover spins freely without the key, you might try cutting it off using a Dremel tool if drilling it out doesn't work. 

1973 L-82 4 spd

Thank you! We are gathering ideas before we dive in. 

Will post results when we get it figured out.

Locksmith? They can make a key.

That is our next move, thank you!

Any updates on this dilemma? 

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Yes! The original owner had some keys he did not know what they were for so he shipped them all to us.

Keys for wheel locks and gas cap were included, plus an extra set of original ignition & door keys. We had to pound a socket on the lugs underneath the lock to get them off, but all is well that ends well!

Thank you, everyone for all the help and suggestions :)

Hello, Did you try Metric as well as S.A.E. sized sockets? 

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The 3/4 inch socket work worked best.