65 Chevy k10 front spring shackles

[Boyercope03]

Hey everybody I'm restoring a 1965 k10 and I was looking to
purchase new front shackles from LMC part # 34-1356.
Unfortunately they do not carry the 64-66 kit any longer but they do carry
the 60-63 kit part # 34-1355. Anybody know what changed those years? The only other place I'm finding shackles that are for my truck are from Brothers Truck part and there's look different then original. Anybody ever use there Shackle kits? Thank you.