I would be surprised if its different for 80 Vs. the other years.
In reviewing the 78-81 Parts catalog I see part numbers for Lil Red and Warlock but none for the non chrome plated/no hole versions.
I'll keep digging and I do have a few extra sets of steps I can measure.
Are you looking for driver quality, 6.5' box?
Note the one guy I know manufactured these for short box was Bruce Horkey but he is showing them as currently not available.
I earned my title by questioning a members declaration that he was dating a 17 year old when he was 28. Yes he would not like the outcome of his visit to my house to pick up my 17 year old daughter!