Yes, #1 and 2 are both R3 car. Those two I own. There was also a R4 convertible. Serial number 1 convertible was a build mule for the 64 convertible and was actually built on a frame with no X member. I don’t think this car was ever intended to leave Studebaker and sold to the general public. However, in the total confusion at the end, Paxton ended up with the car and sold it. Paxton took advantage of no X member as the car was a little lighter than the sister car. It was equipped with a 3.31 gear as opposed to a 3.07 and was used for the standing start runs. The other car, #2, was used for long range runs and had the 3.07.