JBL D2430H D2 compression driver bolt size

Hi gang, I recently bought the jBl D2 I mounted it on a car horn that’s a 1.4” horn and my goodness what a good driver.

By far , the best CD I’ve ever used. I like it better then the TAD TD2001. This JBL has the best highs I’ve ever heard…

So I’m buying another set and adapting them to another horn, the other horn which is better, doesn’t have the holes drilled for the bolt pattern,..

Does anyone know the bolt patter offset or know where I can find a drawing?

Thanks in advance