Here is the look at the inside.
Also the heat sink sitting inside -- after I bend the 'wings' towards the center of the plate. You might see that the edges are close to the edge of case. It is firmly pushed back. It is blocked by the the flat part of the plate as it comes into contact with the shrinking profile of the case. It is also getting tight at the left and right... and if it goes even further into the case it will be the sides that will next be the problem.
Next, I tip the plate (heat sink) to the side and the left is pushed in all of way. it shows that I am not blocked by the sides (yet) but by the top-to-bottom distance of the plate.
Finally, I show the tape measure to provide a measurable comparison to your unit(s). About 5.25" outside top-to-bottom. The inner part of the plate is 4.0" from inside bend to inside bend.
So... I think the plate width should be shortened by... maybe 0.5" and the bends should come closer to each other so that 3.5" separates each. It might mean shortening the height of the plate by 0.5" as well. I don't know what a loss of a 0.25" border would mean to the protection provided by this heat sink. The thicker stock should offset the loss, but the thicker stock was a one-time mistake from the supplier.
It is really hard to tell. As the plate sits back further the lens will not be held in place by the glass face. Still, with a smaller verticle and horizontal distance the plate can be brought forward and not rest on the case... and then be held the right distance from the glass with the screws.
Hope that helps describe the problem, and what might be a solution. I don't know if bringing it in will be a univeral problem for all builders, maybe it will be too small for the larger cases.
NOTE: in the pictures I use colored wire for the LED connection. This does NOT imply that they match to the actual colors/channels for the LED. Instead, I soldered 4 at a time and used the colors to help match the front connections (1-4) to the back (1-4) and repeated for 5-8. I just didn't want to confuse anyone to make an assumption based on my wiring.