Suggestions on gluing up ABS Plastic.

[TogaLock77]

I want to install four "Raptor Like" grille marker lights. I have a 2019 Tradesman with factory grill. My plan is to cut pieces of 1/4 black ABS to either fit in the top grille holes or cut a single larger piece to fit behind the grill. I can then mount the individual LEDs to this ABS. I'm wondering what the best way to affix this ABS to the ABS grill? Is there a glue with a strong enough bond to hold the two pieces of plastic together?

 

[Gondul]

I've used JB Weld Plastic Bonder, works on thermoplastics ( ABS is a thermoplastic)
They also have black but I've only been able to find the tan.

 

[Crusty old shellback]

Go to a body shop supply store. They will have everything you need. There is an adhesive made especially for car ABS material.
I've used it in the past and it holds up.