'68 Charger 3 speaker dash hole cutting template/measurements/dimensions

[challenger70]

I just got my car blasted and it is time to get serious about actually putting the car back together!  I would like to add the 3 speaker dash and have the grills already, is there such a thing as a template floating around or measurements where to cut the holes in the dash?  Also which way are the grills supposed to face as they are not square.  I appreciate all help/pictures/advice.   

[tan top]

not got any templates  , I did have a number of  good pictures saved of the three speaker set up , but sadly lost loads of info pictures when computer blew up a few years back .

this is all I have now ,

[70 sublime]

one picture I have