The MC28 seat unit is longer than the MC21 seat, and fits snug to the frame. The front lower mounts, and also the prongs that press into the lugs on the tank, are in different places on the two bikes.

You can cut the prongs off the MC28 seat (or fit an MC28 tank!), and possibly get some spacers from TYGA like the ones they supply with their GP500 seat unit to secure the bottom mounts.
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Andy.
NSR-WORLD.COM

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