Hi Mike,
I agree, the accessories are pretty hard to come by. Thankfully I have most of them already, including the extension arm to print 16x20, spare 35mm and MF condensors, etc. I actually thought I had the Sivopar 66 from when I got it a few years ago as I got everything else I could have wanted for MF, but I've been all 35mm the past couple years. When I finally went to set it up yesterday for 6x6, that's when I realized it I didn't. On top of that I found that my enlarger timer had decided to stop working since I last used it in the spring... DOH!