the MKII escort rack is fine without needing to be shortened.....
BUT
if you make the rack extensions as per book dimensions then they will be incorrect & make your wheels both steer outwards, in fact undriveable.
I,m using a std MKII escort with extensions purchased from Rally Design, sorry don,t have a link but the parts are available on their website.
the rack is new, cost £65 & the extensions are new, cost £25.
hope this helps.
cheers
andy