They are either on the right side of the receiver OR barrel.
Try gunshops, gun shows, pawn shops, estate sales, for sale ads, want ads, garage sales.
here is a link to a similar browning I found. http://www.collectorsfirearms.com/admin/new_arrivals.php
Shock buffer
The serial number will be located either above the left-rear wheel or behind the right front wheel on the chassis. You will see a bar-coded sticker with a number below/above it. That is the serial number.
The wheel bearing
Rear wheel drive, 4x4 is dominate rear wheel drive
Remove spindle, bring to auto mech shop to press apart.
It depends on which sight is mounted. Recommend you check the manual and consult your local gunsmith use the link below
Rear wheel
Rear wheel with an option of all wheel drive.Rear wheel with an option of all wheel drive.
The 2003 Ford Expedition has rear wheel drive.
The 2003 Ford Explorer has rear wheel drive.