i have been informed by bernie (gearboxman / CTS) that they are no longer available. i will be rebuilding my t5 in the next couple of weeks and will have to be careful when removing it.
on this topic, someone else said that they could be bought from USA, but not sure if it's true. i hope i don't have to find out.
https://passionford.com/forum/viewtopic.php?t=144107