Actually, even if they do have parts, they refuse to sell them. Warranty only. I was told this when mine was a whole 2 weeks out of warranty. Luckily I talked them into sending me a new glass panel, glass was seperating from the frame. And it was just sitting in the box the first year I owned it. Bought it for a future build when they were drying up.
They won't sell parts for any case, even current ones in the U.S., so after the warranty is out, too bad. As much as I love my Define R6, it may be the last Fractal case I ever buy.
All that aside, how are you attaching the solid cover without the vented insert? That's what attaches to the case, and without it it won't have the tabs to snap in place.. It should be under the solid cover.