The heat shields are the same for the 383/440 that hold the insulation

Silencer Package Was Called
Part number - 1879 747
383 - 440



The holes are spaced 100 % the same on the hold down bars for 383 / 440

On a 440 the valley pan hold down bars are just longer on the ends , hence different part numbers for bars

Picture is 440 RB Hold Down Bars - Heat shields for 383/440

440 & 383 both have the same holes but the 440 is 8 1/4 long & the 383 is 7 1/4 long