There are also a few people on this FB group who would like the BB saved. https://www.facebook.com/groups/1660980737503481/
Some may also be members here.
Fits fine in mine. Would fit even better if I'd clean up the opening cut and shorten my dip tube, but I've brewed a few times with it like this and not had any problems.
Another option he has now are these weldless Tri-Clover bulkheads.
https://www.brewhardware.com/product_p/tc15wlf.htm
I didn't mean to imply that the size the Pot doesn't matter just that the one he linked will work fine unless he has picked an odd SSVR. Most all of them on Amazon are 470K 2w or 470K-560K 2w and the Pot he linked to is a 470K 2W.
If you want to save money the Still Dragon kit is about the cheapest way to get most of what you need. http://stilldragon.com/index.php/diy-controller-kit.html
As for the contactor if you find a switch that can handle the amps you intend to run at you don't necessarily need it. It's usually...