It's been put in a "safe place"...
I found the plastic surround for it but not the springs/screws/back-plate (which is the bit you want) which are all "safely put away"... I'll keep looking, but I wouldn't hold out a lot of hope... last item I put in a "safe place" (about 2 years back) my wife found a couple of days ago...
(one of those,
"Do these look like anything to you, Ken?" moments that wives are so good at...)
Still looking for my Peter Cook pup, and the cover for the failed one... did find a surround for one, also found the chrome "spares" from my "hybrid" schallers, so not a total waste of a dig-around... absolutely no use to you though, Jules... sorry...
Crikey, Mark... just looked at your original link... wanted $79 for that little bit of wood you were after...