if you’re OK trawling through tech drawings, then partsfan.com can help you with this
you can buy the parts new for them from Japan if you can’t find local gear from wreckers
AFAIK the copen L880 and sirion rears carry the same parts numbers
that’s one result from a quick search
I think import monster deal with OZ the best?
If not, there are a few of us on here with links to Japan shops who can forward the parts if you want
I keep meaning to compare with yrv turbo because people have told me that they carry a larger rear …but in searching part numbers it seems that there isn’t much different there
not that you really need them larger anyway