Steve,
I did a check o'nite and came up with,
LC 2 door measured at 1.94 / 1.95 fronts and 1.87 backs bolt hole to bolt hole with 0.27 to the adjuster. Buckle strap at 0.37 / 0.38. LC's have a different large thick plate adjuster for the fronts.
LJ fronts 2.15? but I have two at 2.21 /2.22? Adelaide buckle
Sedans 1.80 /1.81f and 175 / 1.78 b. Brisbaine buckle.
I would suggest you PM "Lona CK" john is the guru on all thinks LC.
Have a good look at stitching and weave patterns colour matches, as belts can be easily swapped around and mismatched over the life of these cars. I am still not sure mine are 100% correct.
Length to the aduster I have measured at 0.16 / 0.17,0.22,0.27,0.29 and 0.32? a large variance!
The belts may have had a large variance from original dependant on year and belt manufacture? I have looked at promotial photos and I see differences in these.
G.