I have a F3 (CBR) Fox shock that has been modified to bolt right into a MC21 (and therefore I assume also an MC28) for sale ($275 USD, plus shipping). It has recently been rebuilt with new oil and recharged, and has a longer steel braided line so that the reservoir can mount either in the usual SE/SP position or elsewhere. Works like new, has ride height adjustability, weighs one pound less than SE/SP stocker, and has greater range of compression and rebound adjustment.
Please PM if interested.
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-Jim
'93 MC21