I just bought a set of splined acorn taper seat lugnuts and correct washers from Gorilla. Tried to install them but the lugnuts would not take more that 60 ft lbs due to the washers spreading (not hardened). Even got another set of washers from Gorilla after they swore that the lugnuts torqued fine for them. Well this set was the same as the original set. Got money back on the whole deal. BTW, this is for the ford 20 inch aluminum wheels. Buyer beware from Gorilla!
Mitch
Mitch