6 Lug disc brake using 88-98 spindles ?????

[lolife99]

Without narrowing the upper a-arm,... I don't know an answer.
YOU are the second member to confirm this problem.
We need to get the word out to all that think this is a money saving disc swap.

Install a 1/2-ton lower a-arm and spindle with an aftermarket C10 6-lug rotor,... and you will be back in business.
Of course you will have to swap the ball joints and tie rods back.