Here’s the information for the part with GAP No. 903091:
Product Specification:
This part is designed with a brake stroke of 44mm, a push rod length of 130mm, and features a push rod thread of 1/2″ – 20 UNF. The inlet thread is 1/4″ – 18 NPTF, and it has a port angle of 0° and a clamp angle of 45°. The color of the part is specified as Black, and the type number is T9.