I think I might have a spare gold thingy. I'll check next time I'm in the garage.
As for the plastic - it's a good reason to upgrade to twin disks
I can flog you a single disk cheap if you want one as I upgraded mine to twin and ended up buying a pair of disks for £60. The 916 master cylinder was £51 and included the lines and a pair of calipers was £43, those too came of a 916 as they're the same 40mm spacing. Works a treat!