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Starting with the hardest mod first, I would recommend taking the frame out of the tub and once it is modified, refitting the tub to the frame. The swing arm pivot on the Comet is 1/2" forward and 1" up or higher on the Comet than it is on the twin. It could be that you could add an extra free standing pivot to the Comet just to be the lower mount. It is difficult to say without the pieces at hand. Also, the pivot needs to be fairly robust as the entire tub is cantilevered off the swing arm pivot and the top mount. The top is in tension and the swing arm pivot is in compression and has to take all the weight of the riders, tub and gear.So about these upper and lower mounts differing from a twin.
You think a simple bracket will allow this?
maybe this new bracket triangulated to the sidecar/horn RFM lower tube?