It's odd that some of them come with isolators and some don't .
Mine (RKB101420 / RB / Pink) isn't even listed on Rimmers now so I've bought a pair of KYB's instead. I'll wait & see if I can get the old isolators off without wrecking them before I buy new ones.
I think the original MGR springs tended to snap because of the way they were cut - i.e. tapered instead of 90 degrees.