I tapped 3/8-16 holes for the grounds and the studs on the FFR disconnect switch are 3/8" as well. The studs on the 250A fuse are 5/16" so I got a pack of 3/8" and a pack of 5/16" for both 2 AWG and 4 AWG wire. I ran 8 AWG from the switched side of the disconnect into the dash to power the RF harness in there and so needed a 3/8" lug for 8 AWG wire for that one, which I picked up at Autozone. I am still waiting on some wire loom and couple back-ordered items from DelCity and then I will be done with the power side of the wiring. I'll be updating my thread with more detail when I am done.Nice. What size lugs did you end up using?