rim offset help for my classic

[95 range rover 4x4]

I need to get new tires for my classic i have a 3 inch lift on it with stock rims. i want to put 33x12.5x15. i know a 33x12.5x16 wont fit on my rim without rubbing and i dont want to buy wheel spacers. im going to buy cragar soft 8 rims from summit racing since there only 52 bucks a rim. but i dont know what off set will work for my classic to fit 33x12.5x15 so i dont need any spacers.
thank you

[cdb]

Are you sure you have a 3"lift?
If so, you should have a modified driveline.

[95 range rover 4x4]

yes i do