Ouch, good luck, guess you have a Bubba hub or similar.
Try Sachs Maillard with shimano spacing.
My Dyna Tech roadie has Campag Athena hubs with screw on block and I had to buy a new one off the bay!
Try St John street cycles.
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale M1000 Deore XT M730. 1992 Raleigh Dyna Tech Quantum Deore XT.
Retro Road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti Campagnolo Athena 8 Ergopower.
Modern: 2004 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.