Headlight bar rubber gaskets

[NZ28ModelA]

Hi Fellow Model A Drivers,

i have just replaced the rubber gaskets beneath my headlight bars because they were stretched out and looked horrible.
Unfortunately when i tightened the nuts up after fitting the new ones, they are just as stretched out as the old ones!
I guess i have over tightened them, but i presumed a structural bracket like that would have to be pretty tight??

Kindest regards

Steve