according to my parts manual and Hollander, no problem: '57 Windsor has 12 " x 2 1/2 " shoes as Imperial ( '58 Windsor has 11" brake). Wheel and master cylinders are identical. There was some changes in late '58 but only for standard brakes master cylinder (non adjustable pushrod; master cylinder casting: 1850 162) -- Philippe COURANT (Pau, France) Imperial 57 Crown convertible Buick 58 Roadmaster sedan - American Car Club de France (ACCF) : http://www.accf.com - Chrysler Imperial France : http://www.ifrance.com/c-i-f - Cadillac " Standard of Excellence " : http://www.ifrance.com/accf-cad - SportsCars : http://www.ifrance.com/accf-sprtcar