The #153 "Scale" Short Coupler will work anywhere a #23, #33, & #143 Coupler will work. The #153 Kadee Magne-Matic WHISKER Coupler features a All Metal Coupler, Metal WHISKER Centering Spring. The #153 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.