70 challenger horns

[Avalanche]

This may be a dumb question but, I do not have any horns in my 70 challenger and was looking for something aftermarket that somewhat resembles stock.
Does any 12v horn work and do I need 2 (high and low).
If anyone has a picture of a stock set-up that would be great.
Thanks

 

[Moparparts]

I have some originals for sale if you need them PM me