When out of stock you can use part # 370062511 as a replacement but ensure you have sufficient clearance for the motor as the mounting pattern differs (offset bolts vs. center bolts).
HYDROMAX BRAKE BOOSTER-2771293 2771371
FORD TRUCK HYDROBOOST WITH 1 WIRE SWITCH ON THE BACK. CASTING NUMBER IS 2771293 OR 2771371.
Return core for $75.00 credit CORE CHARGE IS ALREADY INCLUDED IN THE PRICE. MUST BE RETURNED WITHIN 60 DAYS AND CUSTOMER IS RESPONSIBLE FOR ALL COSTS IN RETURNING THE CORE.
You will have to reuse your old pedal rod.
Click for Video explaining how the change your pedal rod.
HYDRO-MAX BRAKE SYSTEM TECHNICAL MANUAL
52980315