For the cost of a rear brack compared to a front one (and the pain they are to fit) they are not really worthwhile
There is alot of metal between the two rear towers compared to the front so the difference if any would not be noticeable
FWIW I was intrigued about how effective they were so I put some wet paint on one side of mine ramed a bit of foam under the end ofthe bar and went for a drive
the end of the bar pushed the wet paint approx 6-8mm so there is definatly movement there
for thinking outside the square this is my one same as normal design that I make but has trangle braces back to fire wall with rear backing plate behind.
I used to incorporate a brake master cylinder stopper in the brace as well but I only did that on a few and I couldn't tell you who has those ones these days!
Mickfred has a modified whiteline one (so it fitted properly) and we also put a stopper on it too!
I'll see if I can find more pics
Mine:
MK-II


MK-I (with stopper)


Rear behind seat (one off) sold to juffa when he had the blue car location unknown now i guess

another MK-I
dunno who this was for

MK-I.5
booster stopper only

Single hoop over 2.5 inch
with shelf rail


Single hoop over 2.0 inch
no shelf rail (powder coated metalic black)
Now on the arthur mobile!

Single hoop style bar 2.0 inch

Double hoop Style bar 2.0 inch

all of these are options to help stiffen up the car other than doing the rear strut brace
FWIW I havn't ever made one nor been asked too because I don't see the point
