Ya know, I have never been a big stepper fan. Looking at your truck closely I finally realized why.
Most of the stepsides I ever saw that were customized were 81-87's . I just didn't like the 73-80 body lines on the bed with the 81-87 body line on the cab.
Seeing yours and a couple of others on the forum has made me start to want a 73-80 stepside....