I have just created LXF file containing rectracted LAs.
LAs.lxf
There are 21 of them, each with different length (with step of 0.25 stud).
There are 4 groups:
1. length 0, 1, 2, 3, 4, 5
2. length 0.25, 1.25, 2.25, 3.25, 4.25
3. length 0.5, 1.5, 2.5, 3.5, 4.5
4. length 0.75, 1.75, 2.75, 3.75, 4.75
(remove the extra axles and other parts, they are there just to prove propper alignment).