Hi there all..
I had forgotton about this post..
There are some other cars available in the "Pullback Racers" series other than the ones you have mentioned, but they seem to be very hard to find..
Plus.. The Japanese white LMP type car and the focus style Rally Car (sorry cant remember their names).
Two of these I purchased from a local shop, the other two from the internet (ebay).
I think King and Doc came from a race set, as they were motorised, but not slotcars. They also seem to me slightly bigger than 1:32, probably around 1:30th, but they look good going around the track and fit in well..
Sally was a R/C car purchased from Ebay.
Ramone was purchased from a Bootsale/Fleamarket. No idea who makes it, just one of those lucky finds.
I also found "Mac" (Lightning McQueens transporter) at a Bootsale/Fleamarket. I believe it came from the Disney store, and was used as a carry case/playset for some of the other "Cars" cars. It did not have a trailer with it, but I have now found a suitable trailer to convert. Its great with the kids, as it has a sound chip in it, so when you press the top of the cab down it "speaks", they love it.
By the way.. All these conversions are made of Plastic, No Diecasts..
All I can suggest is that you keep searching the shops and the internet as they are out there, just a question of being lucky enough to find them...
All the best.. Martin.