Looking for some steps specifically for a 72 GMC

[AirSpeed]

I am trying to find a pair of good looking aluminum steps similar to the ones pictured that are designed specifically for a 72 GMC. My truck has a 4" lift that makes it difficult for my wife as well as myself to climb in. I saw some retractable steps awhile back but cant find them again, they were small and cost about $50 per side.
Whether I find a pair of retractable or solid steps I would like to find some that mount to the frame, not to the rockers and flloor, all the steps I have seen mount to the rockers, it seems like a flimsy way to mount them.
Do any of you know of any steps like I have described?
Thanks for any info! Aaron