Check out the 47-55 Chevrolet Truck Factory Assembly Manual
Section 11 (CAB AND SHEET METAL INSTRUCTION MANUAL)
Sheet 19.00 - REAR FENDER TO BODY & CENTER BRACE INSTRUCTION
Models 3102, 3103, 3104, 3112, 3604, 3804 (pickup truck models are in bold)
No anti-squeak is shown (rear fender is shown)
Sheet 20.00 - REAR FENDER & BODY ANTI_SQUEAK INSTRUCTION
Models 3105, 3106, 3107, 3116, 3805, 3807 (all panel body trucks)
Anti-squeak is shown (rear fender and beaded fender welting is shown)