The holes line up fine on each rail front to back.

The problem is trying to find the bolt spacings between the two rails which needs to be around 372mm.

Seems to be 4 different types of commodore bolt patterns.

1) 350mm <---My one in post
2) 372mm <----Ideal!!!
3) 5mm out either way (only heard about this one not seen) <---- Second choice, hone the hole out, job done!
4) As above post 340mm