Shortly after buying my first Mk1 RS Escort back in the early 1980’s, I discovered that there were differences in the Anti Roll Bars that were fitted to the RS range when compared with the standard cars. One of the most noticeable differences being the length from the front cross piece of the bar back to were it mounts in the Track Control Arm, The Twincam/Mexico style bar is about ¾” shorter than the standard one.
A guy who had been around Mk1’s for much longer than I, told me that this was because RS’s were fitted with 13” wheels as opposed to the 12” wheels on a standard car. The shorter bar was needed to pull the larger wheel and tyre forward so that they wouldn’t foul or catch on the back edge of the wing or the area of the front footwells. It sounded a reasonable enough reason - and in my innocence I believed him!
Sometime later I discovered for myself that the reason he had given was wrong (I’m trying to be diplomatic here). Yes the rearward arms of the bar were shorter but the mounting point was moved further back on the mounting bracket which to the best of my knowledge left the wheel only very little further forward, this had the effect of a very slight increase in castor – or the self centring effect of the steering as it is known. I think the reason for the shorter arms was to increase the effective stiffness of the bar.
All of this means that if you are using a standard bar, you must use the standard bracket and if you are using the Twincam/Mexico style bar then you must use the mounting brackets that go with that bar. If you mix these items up you will end up with your steering angles all wrong and a seriously miss-handling car.
That’s all well and good, but what if you have a Twincam/Mexico anti roll bar but cant find the proper mounts to go with it – well the answer is quite simple, do what Ford did, they didn’t make one specially for the Twincam/Mexico etc, they just took standard mounts and modified them. *found this on the web explains it better than I can lol*