If it is the small diameter (1.36") they have the same bolt spacing as a Rem 700, so almost any action inletted for a 700 can work. You will have to enlarge the recoil lug area forward to accommodate the longer action, but that will be filled in when you bed the action with a quality epoxy like Devcon.
If you were not planing on a good bedding job, you will probably have to Special Order one and WAAAAAAIT.
This is what I have done on the three 7500's that I have. Which I have been pillar bedded with Devcon
Dave