20" XKR rims

[chargerman]

I am doing the dunsfield vmax run this friday in my 98 XJR, woz wondering about putting on some 9 x 20 XKR rims on the rear to increase my gearing

Has anyone tried this before? i've been told they will fit

And more importantly, any ideas were i could buy/borrow/rent some for the day, just for a couple of high speed runs?

Would obviously leave a hefty deposit with anyone letting me use there wheels

Thanks in advance David