yes i see. finally got someone to post a pic of the 2 next to each other. Now, imagine a 2" or 1.5" lift block on top of the Gen1 spring. They become "about" the same length.
Another observation i see here is the spring. Gen2 springs must be bigger OD by atlease 1/2 " or more. Which can be corrected.
What im more interested in, is " if dissassembled will the Gen1 spring fit on the spring perch of the Gen2? Regardless of the length". This is going to tell me alot, and which way to make it work.
Theory,
Option#1
If the Gen1 spring fits in the spring perch of Gen2, than the coil over system can be used on the Gen2 shock, with Gen1 spring and set for ride height. 580 lbs per inch and would easily be set for Mid Perch setting.
Option #2
Geisor spring for gen2 problem solved.
Option #3
Ill pay for 1 off custom springs to make it work.......... it cant be to difficult to find something that will work as so many options for the ford trucks between f150-f350 just finding the correct fitment and rates, but the coil over system makes that easier to manage.
Since you have both in front of you, take them apart for us and see what we got.