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Maybe there is still stock here, if you need a thread-on adaptor (but not good for fixed gear unless welded/glued/bolted on)
https://www.tyteesshop.com/index.php?main_page=product_info&products_id=207278 -
do you know roughly how much it might cost?
Far more than it's worth.
If you have a threaded 6-speed freewheel hub and just want to make it into a suicide hub with a decent chainline, much the best way to do it is to move some spacers from right to left and re-dish the wheel.
If you have a monobloc type wheel (Disc, Hed3, Corima 4-spoke etc.) then you already have the adapter, and nothing I can do will make it less of a suicide hub.
@mdcc_tester Would you able to help us out and redraw this in a track version by any chance? Could you recommend someone who could make them and do you know roughly how much it might cost?
Thanks