I have the box and follower for 65 shipped. I may have the midlength bolt stop somewhere and will look. This is 3.24 measuring with my calipers.
Short Action Mid Length Kit - Wyatt's Outdoors
This Mid Length PRC kit is designed to be used in a Remington short action. It will NOT work in most clones! Includes box, follower, spring, and bolt stop.
wyattsoutdoor.com