Morning all, & the P@@S taker!
Over the years I have tried obtaining linkage bearings from alternative sources without much success.
A few are available, but most aren't it would seem. As SVrash has pointed out, you need to replace the spacers too, & these are definitely O/E only.
It's bite the bullet, & cough I'm afraid.
It's well worth stripping & greasing the linkage at regular intervals, using a high quality grease. My mates 900 Divvy has just required new linkage bearings, after over 100k of all weather dispatching. The linkage had been cleaned & greased every 16k. Whereas I have had to replace bearings on other Divvys at less than 20k where they hadn't been greased at all.
A point worth mentioning is that many bearing factors grossly over inflate the list prices of bearings, so they can look good when offering you a 50% discount, & still cop a fair few bob. I was perusing Midland bearings website a few months back, & saw standard ballraces, such as found in SV wheels, being listed at £28+VAT each! £8 or £9 is more like it.
Cheers.