Fellows,
I know it is a bit off topic but anything to do with tracks is unavoidably expensive. In my case, brand new aftermarket weasel tracks are now available at $9500USD a pair

, plus freight/shipping, plus taxes, plus plus plus. Much that I would like to purchase a set I just don't have that amount of spare cash lying around

. Now my point is when faced with the expensive reality of getting mobile, it then gives you more incentive to look outside the square at more economical track repair solutions. In the case of Bren Carriers, I can't offer any advice but in my weasel realm I do have a less costly solution to my track fix.
Whatever avenue you choose to go down, good luck.

Cheers
John Wilson