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Yes, you are correct the center holes in the backing plates had to be opened up. This had to be done so the axle bearings would fit through the backing plates when installing them into the housing. I am using the Backing plates off of a 70 chevelle.
The Bendix part number for the shoes is 245, all of the hardware (springs, wheel cylinders) is for the Chevelle also. (I like the 70 chevelle bolt into place wheel cylinders beter than the stock 80's GM that are held in place with a snap ring). The hole in the center of the stock brake drums had to be opened up to 2.800 in order to fit over the center of the Moser 33 spline axles.
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My Truck:
1977 GMC 4x4, seen on the cover of January 2004 Off Road Magazine.
Wifes car:
1987 WE-4, TSM car,
DLS 3.625 rotating assembly, oil pump, RJC girdle, GN1 heads, HARTLINE Performance engine management Fast XFI & AMS 1000, Cotton's 3.5 custom down pipe & Aeromotive fuel system.
Tons of labor from several friends.
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