Caliper Backing Plates?

[crankshaft]

OK, need a caliper backing plate for a project. I have a D44HD axle from a 74ish 3/4 GM truck...they no longer make backing plates for this application (factory)...what is the difference in the backing plates from 74-77 and 77+ and is there a difference in the 1/2ton and 3/4 ton GM D44 front axle caliper backing plate...or even the 10-bolt caliper backing plate.

Can I use any of these on my 74 and not need to change a bunch of other stuff? Or are there specific differenced that would affect swapping one another??

thanks,
crankshaft