Try Scott Wilson at
http://concourseparts.com.au/ or call 0244231215 b.h. as he manufactures new oval plates. These are injection moulded in white, yellow and opaque (clear) very worksy lookin. They are a exact replica of the Yamaha yz, mx number plates and they are of top quality.
I think he's also going to mould green soon. They look great with contact applied for your application.
Scott is also in the process of manufacturing new gaurds and side plates for may yamaha applications. I have had a sneak peek of the yz125,250,400 1977 front gaurds and they are better than NEW OLD STOCK perfect.
This guy is a perfectionst and will not release a crappy product as he want's his stuff spot on and he's a real nice guy.
Just tell him Adam with the YZ's sent you. HA HA.
He's a pic of the first off YZ 1977 gaurds etc.
Also check out his blog of bikes under restoration or finshed awsome totally awsome.
http://www.yz125d.blogspot.com/[attachment deleted by admin]