637RA002

OE Core: 38" X 26" X 2 1/4" (3R)
Inlet Conn: 1" Top right
Outlet Conn: 1 1/4" Bottom right

OE#'s 20001-3205, 200013205, 20001-3249, 200013249, 20001-3283, 200013249, 2001-4602, 20014602
WG Series 1990

637RA011

OE Core: 38 5/8" X 26 3/4" X 2 1/4" (3R)
Inlet Conn: 2 3/8" Top right 6 5/8" to center
Outlet Conn: 2 3/8" Bottom left 6 5/8" to center

OE#'s 1676009
WG Series 1991-2001

637RA608

OE Core: 31 3/4" X 40 1/2" X 2 1/4" (3R)
Inlet Conn: 2 3/8" Top right
Outlet Conn: Bottom dual bolt-on flanges

Oe#'s 1030031, 21901-0002, 219010002, 21901-3206, 219013206
WG95, Autocar ACL 95-2000