Escort Rear ARB

What are people's thoughts on using a rear anti-roll bar on a Mk1 for tarmac rally purposes?
My car does not have the chassis rail holes for one so not even sure if I can easily retro fit.
I will use a twin cam bar on the front. Is the standard twin cam diameter (22mm???) considered sufficient?
My car does not have the chassis rail holes for one so not even sure if I can easily retro fit.
I will use a twin cam bar on the front. Is the standard twin cam diameter (22mm???) considered sufficient?