Ford F350 rims on a GMC 2500 - Lug nuts?

[Pete70GMC2500]

I have a set of Ford F350 (1 ton) rims that I want to put on my GMC 2500 3/4 ton 2WD with a Dana 60 rear end. The ford rims have the right 8 lug 6.5 inch pattern, but the lug holes are a tad larger than the lug holes on my existing rims. Existing rims 0.64 inch, ford rims 0.68 inch lug hole. I need lug nuts that have the 2500 size & thread, but the larger taper diameter to fit the ford rims. Do these exist anywhere or am I SOL?

Thanks,
Pete
'70 GMC 2500 2WD longbed