Thanks for the compliments Ron. I kind of designed them, I did the same thing as you did...I searched the internet until I found what I liked. I ended up liking a few different aspects of a few different sliders, so I combined them and this is what I came up with. My only recommendation would be to either make the rear kick out farther back (closer to the rear tire), or don't make it at all. It's really an inconvenience for people getting in and out of the back seat. They hit the back of your legs, and will get pants dirty, and can leave a bruise if hit hard enough.
I hadn't noticed this, until my mother-in-law got a big dirt mark on the back of her white pants when she was getting out of the car at church! Ooops. I will take some measurements, and see if I can modify the placement of that kick out to make it perfect. Other than that, I wouldn't change a thing about them. They are SO stout!
I won't be needing any credit either. I just wanted to make sure you knew you could come to me for some measurements and help. If any credit is due, it's to FabWerks. My buddy runs this small business out of his garage, he made the sliders for me. I can't weld...nor do I have any practical knowledge of building anything out of metal.
I will work on those measurements tonight.