I'm quite sure that sometime in the past the free length of carrier springs have been posted, I can't locate the post.
Ben has been kind enough to supply me with a comparison photo between UC front/rear outer against a couple of the inner types.
The Loyd TT parts book states:
Outer - TL332
Inner - TL1386

Inner
Does anyone have a period indication of the number or coils and free lengths of either of these? As you can see the Loyd that I'm stripping has inner and outer springs of the same length, both are 9.5". Obviously having been compressed for 70 years, 50 of them corroding on a range they may have taken on a set