Here’s the information for the part with GAP No. 903161:
Product Specification:
This part is designed with a brake stroke specified as T16, a push rod length of 160mm, and features a push rod thread of 1/2″ – 20 UNF. The inlet thread is 3/8″ – 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 T16.