65-73 leaf springs the same?

Well, I had to cut the eyelet off the 66's spring (dang bolts wont come out) and now I decided Im going to do the Opentracker leaf spring mod. I have an extra set of spring out of a 68, just wondering if they are the same length. Some parts sites are saying 64-73 are the same with certain springs but not others.

Anyone?

thtas... I figured they were. Im picking up a set of stock height ones tomorrow from Dallas Mustang... We will see how she does with the Opentracker mod