Upgrading sound/front door

I'm looking to upgrade the sound/front door of my mk1 D 4 door hachback, right now it has a hole belou the windows crank with a speaker and a grill (first owner mod). I wanna instal the door stowage box/speaker and i'm not sure of the right part for this. It would be the 4 - 171867133 or 4A 171867134 or the are the same part just the left and right parts?