I installed re-pop LZ brakes on the front and the difference is nothing short of amazing.
Tom
I seem to remember that someone on the H.A.M.B. was making special wide-5 hubs for just this purpose. I did a quick look-see and couldn't find it. Maybe someone else here has a better memory.
That was POSSIBLY a piece made for tire/wheel balancing purposes.
Coop
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Get these from Speedway and have the 5.5 pattern put in them
https://www.speedwaymotors.com/Speedway-Wide-5-Wheel-Adapter-5-on-4-3-4-Inch,29179.html
One thing to keep in mind. I seem to remember that these use 5/8" studs on the wide five pattern. I checked the Speedway listing and it says they require their 1" bolts. From my days of racing modifieds, I think that means 5/8" studs.
They may fit, but measure before you buy.
Or maybe, get a disk brake setup that matches those adapters (5 on 4 3/4").