[TR] TR4 Leaf Springs vs TR4A Straight Axle Leaf Springs (WANTED)

[Chad]

List members-

I am searching for some TR4A Leaf Springs, Front Mounts, and
rear shackles.  Does anyone have some of these laying around surplus?

What
are the differences between TR4 and TR4A leaf springs?  Length?  Spring rate?
I found a set of TR4 springs and shackles, but I don't know if they will fit.
In case you're wondering, I am adapting an 8" Ford rear into my son's
TR6.....or rather my Son is adapting an 8" Ford rear to his TR6.

Thanks,
Chad in Tulsa