I built a 028 using parts from three different saws plus a p/c off of evil-bay. One of the donor saws I took parts off of was a 028 Super. It was the newest saw out of all them, but not the best one. I did yield quite a few parts off of it though. That saw had the rim style clutch assy. on it (which is what I used). I'm assuming the later ones came equipped with that style. Of course it's possible that somebody could have converted it.
I already had my builder in the final stages of completion when I found the Super in a trailer load of scrap. The guy said it was seized up. When I took it apart it had no signs of being seized, in fact, I would have used the 46mm p/c instead of the 44mm one that I bought.
I believe he threw the saw away because the chain brake was on (it was hard to release) and he thought it was seized!!! Yeah, I know, the engine would still be running, but you would have know this guy (enough said). Unfortunately, the saw laid out in the weather for quite some time, which is why I parted it.