Hi, Constant!
This forum is not primarily intended for requests to spareparts unless you want a MULTIPLEX user to help you.
As far as I can see the Cularis is no longer on the MULTPLEX program and neither are most spareparts for this glider. So it is unlikely that MULTILEX can help you. The only way I see at the moment is to buy a Cularis or the sparepart from one of the the usual deals and if that is no longer possible you might get one on eBay - even as a secondhand one.
with regards
profimc