HI I HAVE A HONDA CR 125 1992 MODELthe rear shocky is a kybmy questions are can i fit a latter model shock ? what models will fit? dose it matter if i use a 250 or 450 or 500 rear shock ?is it just the spring that is thicker heavier as i am 110 kgand would like to improve the rear ive looked at rear shock pics and they look much the sameexept the gas can sits a little differant i know the valving will be diferant