used a two part plastic epoxy and form some plexi-glass strips into fins and glued them in looks like it should work out OK, I wish I was a little more skilled and neater going to use a hammered finish paint to cover up any imperfections.
Looks good and if you hit that with some texture satin black 99.9% of the people that see the car will never even notice that it was repaired
One tool that comes in very handy is a hack saw blade,makes nice cuts in the uprights in the fins so you actually insert them into a groove before glueing them
I have been repairing quite a bit of plastic lately,and if anyone that reads this has broken grilles they want to get rid of?please pm me as this has been the work that is helping to support my family as I have been out of work for a year and a half.
Doug