[Gpa113]

Evening 

Having seen a number of the excellent kit builds on the forum recently,  I have a question ? 

Some of the body shells    appear to have been fitted with what looks like to me, a plastic body mount, with a threaded insert?
They seem to be fitted in place with epoxy resin.  I guess they are trimmable for length. 

Am I correct   and if so, does a anybody know where I can buy them?
Even Pendle don't appear to have anything similar.....

Thanks,  
Pip