I just purchased a set of centerline hellcats 15x10 with 3.75" backspacing. Based on what I have been reading I thought these would fit pretty effortlessly. I recently purchased a '85 FJ60 front axle with rebuilt knuckles, new rotors and new warn hubs. I will be doing disc swap off of this axle on to my '72 fj40 axle. When I did a test fit of the wheels it appears they will require some spacers. My question, what type of spacer would be recommended and what is a good source for them?