Here’s the information for the part with GAP No. 903301:
Product Specification:
This part is designed with a brake stroke specified as 64, a push rod length of 255mm, and features a push rod thread of 5/8″ – 18 UNF. The inlet thread is 3/8″ – NPTF, and it has a port angle of 90° and a clamp angle of 0°. The color of the part is specified as Black, and the type number is T30.