Hi Joe, unfortunatley you cant just bolt a new X style starter on to an original starter RAM. The compressor face plate needs to be machined down, also you need a new compressor nut. The original nut is flat faced (and hence the genesis of many RAM starter problems) the new X compressor nut and bendix is acorn shaped. This will necessiate a rebalance.
Good Idea to scout around for a good used starter unit. Scott