The ST200 came with 19mm front and back same as the stock cougar has, the mk2 mondeo has a 19mm at the back and 17mm at front. There are 2 sizes of aftermarket ARB the 21mm that was made my Rousch and then BAT and a 24mm hollow bar as is fitted to Damiens old 3Ltr now being lovingly restored by Wil Leaper
Doesn't change the fact that this would be a great purchase, mate.