Backspacing on factory rims that fit disk brakes

[OX1]

So my disk brakes move WMS outboard, and my
new rims have a bit less backspacing than the factory
drum rims.

Was hoping some of the "Granada" type rims are closer
in backspacing to the orig drum rims.

I would use them in front and then the rims I bought on
the back, to even things out a bit. Right now my front
tire is almost 2" outboard vs the rear.

[simplyconnected]

Isn't that due to the spindles you chose to use?

We normally stick with one of two choices because we know they work well; the OEM spindles that came on your Squarebird, fitted with Scarebird (S-10 brackets) OR Granada spindles with Ford calipers. Either fit Granada wheels without spacers but so do a lot of 14" rim offerings from the big parts houses like Summit. Modern cars all have disk brakes as do most modern 14" wheels. - Dave

[OX1]

Of course, I suspected that going in. But I still want to know
the backspacing answer.

Isn't that due to the spindles you chose to use?

[simplyconnected]

This is a typical Granada 14" X 6" wheel w/3-1/2" back spacing used with no spacers:

THIS is the back spacing you want:

These are 6" x 14" Granada wheels that Howard Prout and Ray Clark are using. There isn't much room between the tire and upper "A" arm. I would not go with 4". Summit sells a host of these wheels in different styles. If you cover with a full wheel cover, who knows what's behind it? - Dave

I don't think Squarebird OEM wheels were 14" X 6" so the original backspacing will be quite different. Also, the 'caliper hump' isn't there (which is the REAL issue).