Front grille fitment

I’m making a pause in the major+ service to paint my boxer trim; while reassembling the front fascia I find the grille to be too big for the opening, to the point of deforming the fiberglass, so before I start cutting and bending I thought I’d ask here if this is normal or if I’m doing something wrong, your feedback is very appreciated.
You can see the part deforming around the position lights as this is a weak spot and there were stress cracks close to the position lights, I repaired these cracks but I think are related to this and might break again.
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I measured the grille, it is approximately 2cm taller than the opening

 

I have been looking at pictures of other bbi’s and some do appear to have the position lights slightly at an angle, still doesn’t feel right to have the fiberglass stressed that much. I’m thinking of maybe grinding down the outer uprights on the grille? Anybody been here before?

 

Although I repaired some damage I didn't reinforce that area.

 

I installed the fascia (bumper) on the car without the grille to test and it seems that the opening stretches when installed, so the grille is oversize to compensate this. I guess it wasn’t noticeable on cars without position lights because there was no weak spot and it could take the stress better.

 

The grille does have two small reliefs in the upper horizontal, and one on the bottom horizontal, but these appear to match the horn base and trumpet positions.

 

Thank you Newman, I found the bumper and grille were hit on the right side, that is why the rightmost vertical bar is bent, and an area around the position light and the coolant drain hole was repaired. Still this is not the reason for the difficult fitment which I’m beginning to think is “normal”.
I decided to disassemble the grille and straighten it, I’m in that process now and I had to use heat on some areas, I’ll reassemble and paint it silver afterwards as the surface is too battered and anodizing will not cover the scratches as primer filler / paint will.
Removing a little bit of the upper end of the outermost vertical bars would be easy, and the shape of the opening is smaller at the ends but I’m afraid this will bend the grille ends up. However I did decide against trimming all the vertical bars because I do not think the pieces could be bent afterwards to make the bolting flanges, aluminum is easy to break.

 

Yes correct, the original tabs are bent when manufactured so I guess it can be done,

 

Just found your thread on the amazingly detailed restoration on the 84 boxer, there is a picture of the fascia that shows the same issue:

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