I've got SRAM pc-58 on all my bikes, works well and has the silver quick link as standard. About Â£18 from almost anywhere, 8sp so should be alright for 7 as same spacing. Pretty much a modern sedis sl.
Somerset, like 'Heartbeat' with newer cars!
Retro MTB: 1992 Cannondale 3.0 Deore XT M730. 1992 Marin Pine Mountain Deore DX M650.
Retro road: 1992 Eddy Merckx Corsa Extra Telekom Shimano 600 STI. 1993 Dyna Tech Ti.
Modern: 2006 Wilier scandium Ultegra 6600. 2014 Wilier GTR Ultegra 6800.