The #156 "Scale" Long Coupler will work anywhere a #26, #36, & #146 Coupler will work. The #156 Kadee Magne-Matic WHISKER Coupler features a All Metal Coupler, Metal WHISKER Centering Spring. The #156 Coupler may be mounted in Manufacturers cast-on coupler pockets or any of our HO-Scale draft gear boxes (except #233 30-series gear box). Includes 25 pair per package.