installation

Hi, I've managed to get my paws on a spanking new UMI Retrofit Kit for W204 C-Class, for a really good price. Somebody just decided for another marque so didn't need the part. This is a genuine boxed Mercedes-Benz part (A204 870 68 96). So I've finally got a chance to get the UMI for a decent...

I have tried to put the hardtop back on for the first time and am not sure its on properly. The passenger side rear side catch seems to be missing a washer. It is very secure annd not going anywhere, but there is a good 4mm gap around the rear sectiion. Is this the way it should be?? Tried many...