scale lightbar mounting brackets

[Dave McFly]

in my current project I am making a Ecto 1 out of a 66 Chevelle wagon. now I am using the stuff that makes up the Ecto 1 from a Polar Lights snap kit. now in the PL kit the light bar attaches to the roof of the caddy body using clips that stick out of the roof. when attatched they look 'okay' but not authentic as the outer edges kind of float. and since the chevelle wagon does not have the clips i am gonna glue the bar to the roof but how would I go about making it look as if the lightbar is bolted to the roof? any ideas would be MOST helpful.