Horn help for a '72

[Jameyo420]

So I'm home for thanksgiving and trying to help my dad get his blazer back together to send off to paint. We got the motor back in last night, and today we're working on getting everything else tied in. He can't seem to remember where the horn mounted! If anyone could help or post a pic that would be great! It's a small thing compared to what all we have to do, but it's driving him nuts!