I didn't find any info about these other than rokblokz website, but decided to give them a shot. Hopefully this will help others who are considering this kit. I am running about 2.5" of lift with 275/70r17 tires on 4.1" b.s. wheels.
I chose the "regular length" over the short. They are packaged very well, with stainless steel hardware, washers, nylon spacers and steel brackets divided for the front and rear sets. Instructions are clear and include large pictures for each step. This was awesome. The quality is top notch IMO.
The rear set is very straight forward. 3 screws with large washers, and a different size spacer for each screw to hold the flap flat against the flare. The mounting holes are slotted for adjustment. I pulled mine all the way out for maximum coverage.
I will admit, the front flaps are not the prettiest when mounted. They sit outside the flare, with visible brackets and hardware. Clear vinyl is included to install on the flare to prevent paint damage from the tight fit of the flaps. I chose to paint the 4 offset brackets (2 per side) satin black so they blend in better. With the instructions, installation is simple and no modifications are necessary. A tab bends backwards and secures the inside of the flap to the bottom of the flare, with a longer screw and spacer to replace the factory screw.
I apologize for the dark pictures. I can get better shots later if anyone cares.
So far I am happy with my purchase. I want mudflaps for paint protection, and it looks like these will do great as long as they hold up. My stock front flaps were trimmed and cut up so much that they were barely hanging on, but still scraping the tires just before full lock.