I agree with red58. Your weather striping may not be as thick as the original. I don't know if your latches are like my 59 GMC Bigbolt LCF, but maybe you can "slot" the strikers with a round file or Dremel tool, to move them inward toward the seat.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket