Part #	A	B
555-50100	3-3/4 in.	3-3/4 in.
555-50102	3-5/8 in.	3-5/8 in.
555-50104	3-3/4 in.	3-3/4 in.
555-50105	3-7/8 in.	3-7/8 in.
555-50107	3-13/16 in.	3-13/16 in.
555-50109*	2-1/4 in.	2-3/4 in.
555-50110*	2-3/8 in.	2-3/4 in.
555-50150	2-1/2 in.	2-1/2 in.
555-50151	3-3/4 in.	3-3/4 in.
555-50152	2-5/8 in.	2-5/8 in.
555-50156	3-3/4 in.	3-3/4 in.
555-50158*	2-1/2 in.	3-1/2 in.
555-50159	3-3/4 in.	3-3/4 in.
555-50160	2-1/2 in.	2-1/2 in.
555-50161	3-3/4 in.	3-3/4 in.
555-50162	2-5/8 in.	2-5/8 in.
555-50163	3-5/8 in.	3-5/8 in.
555-50164	2-9/16 in.	2-9/16 in.
555-50165*	2-1/4 in.	2-5/8 in.
555-50166	3-13/16 in.	3-13/16 in.
555-50168*	2-5/8 in.	3-1/2 in.
555-50169	3-7/8 in.	3-7/8 in.
555-501000	2-9/16 in.	2-9/16 in.
555-501001	3-11/16 in.	3-11/16 in.
555-501002	2-9/16 in.	2-9/16 in.
555-501003	3-11/16 in.	3-11/16 in.
555-501006	3-11/16 in.	3-11/16 in.
555-501032	1-1/2 in.	1-1/2 in.
555-501034	1-1/2 in.	1-1/2 in.
555-501106	3-11/16 in.	3-11/16 in.
555-502140	3-11/16 in.	3-11/16 in.

* Sloped valve cover