SIMON
If all you need is the brush rest, this is what you need to do
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Win these three rests and you will have two back ups. It is just a matter of breaking the rest out of the leather adheasive backing, and it wil lfit you premier sight perfectly. THis is the same thing that I have. I replaced two on my Tamerlane and HC 300, leaving me one. HTe extra one I have I will put into the premier sight in case anyone need s the whole thing.
Mine is not a blank plate. It is actually a 5" sight, but it is plastic and not the quality that came on the originals. I have no doubt that what you are getting on yours is better than what I have. With shipping, it cost me $32.50. This just for the sigh with no pins and no brush rest. I wm going to rob the set screw for my Tamerlane.
About a month or more ago I got the three sight pins. I jumped on it as a buy it now, just to have them if someone needed them. I don't remember what they cost me, but I can go into my Paypal account to see if I can find out.