7.50/r16, they are the equivilent to 265/75r16 or 235/85r16 try finding some lwb rims as they are wider (7.5j as opposed to 6.5j) (more tyre choice).
as for tyres, firestone s.a.ts if you can find them, avon rangers or deestone extra grips, they all look right on a series.
the s.a.ts are...