Wow, neat pictures and info on ROK after all these years. I see what appears to be a framed front cover of his last catalog cover (that I posted in this thread) in the floorboard in one picture. I wonder what path he took after ROKSTOCK went under. I do recall an outfit called Dobi that entered his aftermarket parts space for the Capri in ~1978. They even produced that wicked looking whaletail as a knock-off of his product at of course a lower price. Although it might have seemed crowded at the time there in 1979, if he had jumped straight to BMW aftermarket with the same zeal, I imagine he could have made a go of it as that sweet spot of climbing the adoption S-curve was just getting started for BMW here in the US.
I would love to have my old car back but only if it was in the condition it was when I sold it in 1980. Even so, I recall lots of heartache during its ownership due to poor design and/or manufacturing methods that I'd imagine would have consumed anyone wanting to maintain/own these cars long term. I probably replaced the heater control valve 4 times during the 5 years of ownership (at least it was a cheap, totally mechanical part). The clutch was cable actuated, and mine snapped right at the joint to the clutch fork and stranded me one time. Again, a relatively simple fix, although a pain, once the part was acquired. I recall replacing a rear wheel bearing (pulling the axle out of the solid rear), having to have the diff rebuilt due to a bearing going bad, etc,etc. Looking back, it's easy to forget all the bad stuff (including everything else I've not recalled here, lol) and only have the good/fun memories!
Ah, just recalled another one -- I was pulling out to pass on a 2-lane 55mph highway, and just as I got beside the car I was passing my throttle cable broke. Engine at idle. I was lucky and able to brake hard, get behind the car, and then able to pull off into a large dirt area. Fortunately, I always carried my toolbox with me, and I had extra throttle cable parts in it so it was a quick fix. Then again, this was on the Holley 4bbl setup, so not the factory connection, but nonetheless just another of those long forgotten PIA moments of ownership.
It would seem now that the Bonhams result is in the bag, we're perhaps likely to see more of these coming out of the woodwork in the near future. I wonder if there is even one ROK Turbo numbered car that has been kept nicely all these years out there?