lower roller for a kubota KH 045

[garth curtis]

mid to late 80s kubota kh 045 excavator it looks the same as a kh90 the very common roller (68493-21700) doesn't work
i sent my used roller to miniexcavatorparts.com but they have yet to match it ?

i've been trying to find a replacment lower rollers from my kubota excavator anyone have any advise for me ?
thanks