I've tried the ADDCO rear bar 2 times in the past, probably over 20 years ago.
Never could get it to fit any-which-way, on both a Fusey and a Slab.
When I saw
@67_300_Convertible 300 s bracketry on the springs, I thought 'hey, that's an ADDCO bar, how did he do that?"
My memory is that I could not locate the bar, whether above or below the axle, or pointing forward or rear - no way to get the endlinks close to vertical.
The length of the bar's arms always put the endlink location right at the axle.
Maybe the bar could mount on the axle, but that would require hardware they didn't provide.
My experience with P-S-T's 1" front bar is disappointing also.
Bought one about 15 years ago and couldn't get it to fit properly at the strut rods with the universal saddle bracket setup they provide. (their instructions were typewritten Chenglish with hand-sketches)
Just recently I revisited it and discovered why it doesn't fit. It's the wrong shape - too short and too wide!!!!!!
I was able to get it to fit better this time by using factory clamps to teh strut rod instead of the universal stuff they supplied.
But in so doing, the bar must move rearward, so it causes the links to the frame to lean backward.
But I buttoned it up and drove it, and it made a nice improvement going thru the neighborhood (on 215/75-14 tires, to boot!).
I would be hesitant to buy another one due to the shitty fit.
I have a FirmFeel front bar on another car an it's a great piece, with great installation, and it activates off the LCAs, instead of the strut bars that surely flex a bit and reduce effectiveness. The FF bar is a lot more expensive, but IMO it's worth it.