Andrew, I just buy a bar of nylon and drill out to suit (no bearing) just put it straight over the bolt, can buy a 1 foot rod for about 15 bucks and you will have enough rollers to out last the bike.
The problem with the 84 CR is the roller is of smaller diameter than most of the All Balls units.
Also FYI the 125,250 and 500 are all the same.
Shane