KADEE #10 HO Scale Bulk Pack - 10 pair #5 (NO.5®) Metal Couplers - Medium (9/32") Centerset Shank

KADEE #142 HO Scale 140-Series Whisker® Metal Couplers with Gearboxes - Medium (9/32") Overset Shank

KADEE #144 HO Scale 140-Series Whisker® Metal Couplers with Gearboxes - Short (1/4") Underset Shank

KADEE #147 HO Scale 140-Series Whisker® Metal Couplers with Gearboxes - Medium (9/32") Underset Shank

KADEE #1789 Coupler/Draft Gear Box Extensions