Quote:

you need to knock them out and put new ones but do not buy them from triumph dealer(price)



What he said.

Yes, it can be possible to reuse them, but if an unknown flaw does occur, it could present itself at speed.
I hate it when that happens...

One of many sources
http://www.goallballs.com/home.asp
http://www.goallballs.com/Vehicle_Set.asp
I can't speak for their product quality control. Could well be Chinese junk. The ones I bought from allballs were unmarked besides the size stamps. On the other hand, even some of the well known old school brands, like Fafnir & Timken, are often labeled "Made in China."

We can thank Nixon for China.
;-)