I just got a bimini uni-mount from marinepartsdepot.com.
It is a very wonderful piece, far exceeding my expectation and the quality of the piece that it is replacing. I am glad that I ordered one for the other side (that did not really need replacing) as it will put the other one to shame. The price was excellent and delivery was fast.
No connection to them, just really impressed and wanted to spread the word if anyone is interested.