The 115 wheels have a slightly smaller center hole. The bolt pattern is the same and it will bolt on but won't draw up tight as it should on a 123. The difference is small enough that its pretty easy to open up the opening a little and go.

123 wheels bolt right on the 115 with no issues.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.