Dutch, the 10.50x31 is indeed a direct replacement for the 265x75. (265mm equals 10.5 in.) You 'might' be able to go up to an 11.50x32. This size will be 1/2 inch wider on each side (at the sidewall center), and 1/2 inch bigger at the tire radius. You can compare the clearances you have now, to see if a larger size will fit. A lot will depend on the wheel type you now have (7.5" wide Ford alloys???)

10.50's are a good compromise. That's what I now have on my Bronco.