This aluminium cylinder has a 3/8" UNF x 13mm deep, outlet thread with concave seat.
(A steel adapter is included that has a short female 3/8" UNF thread with a convex seat).
The fluid inlet thread is 7/16" UNF x 15mm deep with a convex seat.
The push rod has a 5/16" UNF thread and a Stroke length of 1.15" (29mm).
MASTER CYLINDER 0.813" (13/16") BORE #MA813