I don't know what brand you have, but the ones I bought have a number on the key which I presume is the number I would look for if I lost them. I took a photo of them so hopefully I can find that photo if I ever lose the key.
If the above options don't pan out. You can usually find a socket that is a close fit and hammer it on and then use an impact wrench to remove. You might ruin your socket in the process, but that is the cost of doing business.
There are several types of Spline. Regular spline, can buy a socket anywhere. Spline where every nut is a lock. Spline with only one lock per wheel. You might not have to ruin all of them depending on which type you have. .
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