In the early 1960's Harters offered the Royal Rodent, Regal Raider, Student Price, and Count Clipper, plus the pan alone.
I think the pan was $2.95. the Rodent $6.95, and the Raider $7.95. I never saw anybody buy or build the Student or the Clipper. But lots of people bought the Rodents and pans.
I bought one Rodent, then used the pan for a bigger rat when the original top wore out. A club member tried to use the Raider proto but it didn't go well. He sold it to me cheap and I used it for a rat until I crashed it in 1973. The 125 square inch proto wing was just as fast as the 80 square inch rat wing. It was hard to get high enough to pass with the Rodent wing.
Later on 40's got bigger and they burned too much fuel. The Harters pan didn't fit anymore and the price of rat went up.
The Goldberg Skat Rat was not worth anything against pan rats.
I still have my 1970 Harters pan rat in flyable condition.