It may have at least the floor mounts. These are at the rear corners of the seat pans. They are easy to look for as they have nuts welded underneath. You can drill all the holes as long as you fit some reinforcement - suggest ~2" square plates about 1/8" thick. Bolts are 7/16UNF. The shoulder mount is in the rear wheel arch - again with a nut which is visible by looking above the wheel, just forward of top centre. If not there, measure off another Alpine.