That's exactly what they did to my Transalp when I worked at Imperial Tobacco. Failed to hot-wire it so pushed it into the bushes to come back later. A couple of months later the police caught the twats, when they went to court the c*nt asked for 151 other cases to be taken into consideration
On some online parts lists you can define what size the bearings are , then like @Buckster just order them from a bearing supplier. I use https://simplybearings.co.uk/shop/?msclkid=6bd2ee34478d1436eeea86681cec8f63&utm_source=bing&utm_medium=cpc&utm_campaign=Simply Bearings Brand&utm_term=simply bearings ltd&utm_content=Simply
Here ya go @Six30 , I've got one in my van as well. British made , not like some of the cheap chinese crap on eBay ..........
https://www.theramppeople.co.uk/loading-ramp-with-double-support-bar-2200mm-long-x-285mm-wide