The bottom one is Huffy built, could be Western Flyer badged. The serial number should be on the rear drop out I believe. Post it and it can be decoded
That seat on the Exercisor should be a $50-$80 seat as it is for a cycle truck and a couple other models. It looks to be a 67 or 68. I wouldn't part it out if I were you but that is just me. Matt