looking at the topcaps and crown I would say they are Quadra 5, exactly the same as the original Quadra except they have a silver crown not a black one. They can have preload adjusted in the elastomer stack by removing the rubber bungs on top of each leg and an allen key inserted and twisted. The steerer was a press fit number so you'd need a special tool. To be honest they are probably not worth it as they were the cheapest in the RS range at the time!