Duster AAR Ducktail Spoiler

It’s great these are being reproduced. I found mine in the 1980s, but was a teenager then. “How important are the screws?” I believe ones I took out were pointed tip Allen heads. But I left them with the shell I got the spoiler from. How are you all mounting your spoilers? Any pictures of how you have been mounting them?
Is there a mounting kit available?