If you look at Construction, the PST and Reilly units appear to be the same and most likely someone is doing private label for the other.

PST



RMS

[img]https://www.reillymotorsports.com/store/image.php?type=D&id=143[/img]

However the Hotchkis units are quite different in construction. The most advantageous part of the Hotchkis design in that the Strut rod engages the LCA the same way the factory unit does, by resting on a machined shoulder. The other units bolt in from the rear which means that the engagement is the clamping force of the faster and the face of the rod which could allow movement of the threaded section. I've seen folks who install Heims onto the threaded section of of a fastener and over time and cycles, the threads will "waller" out the hole. No good, especially if that fastener shears or backs out...you have nothing holding your strut rod to the LCA.