Hi, sorry not to have contributed earlier. These are some shots of my recently restored RGS, which was original before I took it apart in 1995(!). I still have the original guards, the rear having a couple of rust holes. In the photos you can see the pair of braces between the bracket that supports the seat and the bracket that goes between the 2 arrow head pieces. Also, at its bottom at the front, the mudguard bolts on to an L shaped piece that links it to the frame. This isn't the same as used on the Goldie, where at least the parts book shows the rubber block in use.
Hope that helps,
Jon