Hi - I just picked up a 1981 H33 and am replacing just about everything - need some help on this one. Mainsheet car pulled loose and sent the boom flying - minor injury. The o to their part is listed as a Ronstan RF666. (the number is fitting) - when I go to their catalog, it is a totally different part. Anyone have a recommendation, for perhaps a part that will fit on the track and have a higher capacity ?