The line lock "kit" is two solenoids, four steel braided brake lines, and a cheap switch with long leads. I looked at a
Hurst solenoid and it looked identical (other than color) to the GMS ones. I'm betting that all the solenoids are sourced from the same supplier. It's hard to screw up brake lines and I didn't use the GMS switch so not too worried about GMS on this one. Took forever to get here though - it was backordered last summer for almost two months.
Line locks are really nice to have - especially with a manual trans. The gold anodized solenoids add a little color and interest under the hood too. At shows I get a lot of people wondering what they are. I've seen more than a few guys pointing at the solenoids and whispering to their buddy, "he's got a supercharger - and nitrous too!"