Fabbed nut plate backer for left side of right diffuser to right center baffle. Started fitting left diffuser inlet to left inlet baffle and left side baffle. Lots of measuring and trimming to get correct fit to inlet baffle angle. Finally secured left inlet diffuser laterally to cowl aluminum inlet ring with a 1/4” gap between. Styrofoam insert really helps to establish concentric lines between aluminum inlet ring and diffuser inlet.