Just got my hands on a cool vintage Unity spotlight (with the Ford logo on it) with the correct mounting bracket for a bumpside truck. (Thanks Robert!

) I figure it'll look pretty cool (and period-correct) on the choptop.
Anyway, I was wondering if anyone had any vintage Unity spotlight mounting instructions in their collections? The main thing I'm wondering is what size of hole needs to be drilled, and how the angle of the hole is figured out. I could probably just wing it and use the mounting bracket as a rough template for the hole angle, but I've only got once chance to get it right, and I'd kinda like to.

I spent a few minutes searching through
Unity's website, and found that I could get a mounting template (free of charge), but I really don't want to buy a mounting kit (that I don't need) just to get a copy of the installation instructions. I sent them an e-mail asking for a copy of the template and asked if they could also just e-mail a copy of the installation instructions, so I'll just wait and see what I get back.