Top Plate Model 255 Series 400 timers ( 440, 440i, 460i, 460TC ) = PN 3019871 used on all 255 made after 2011
And this can be used to replace Top Plates of older 255 and 155
BUT would REQUIRED these accessories ( Separate Items
, and can be included with top plate if selected )
1 ) One Piece Spring, AP1235341
( your old one had individual springs )
2 ) Cover new 400 Series, AP3019870 ( older 20F cover does not fit new top plate design ).
3 ) Camshaft bearing, new style, AP3019873,
( Your old camshaft, if 155 or 255 would still work ).
** You should also consider getting the Upper Valve Body instead, as it includes these parts plus so much more