Roll Bars, Seats, and belts

Given my recent inverted excursion, I want to add a roll bar to the
Midget. Does anyone have recommendations on manufacturers/suppliers?
Moss lists a roll bar, but it states application for '61-'69.
 
At the same time I'd llike to know if any of you have used
aftermarket/reace seats in your spridgets - what are the pros and cons
of these vs. the stock seats?  In my case, the stick seats need new
rubber straps, and probably a total rebuild, so I'm looking for the best
option for my money.
 
Thanks guys!
 
-=Chris