7Klaxon horn question HELP!

[Guest Bob Kerr]

I am at my wits end trying to figure out which klaxon horn goes in my 1924 late style Oldsmobile model 30B touring. I have been told the motor is under the dash and bell part goes through the firewall and is a "reverse cone shape possily a number 5. My book (olds factory instruction manual)shows a number 7 horn used which has a regular type bell and a notch in the housing for the motor. There is a notch in the factory hole in the firewall and the hole size is smaller than the average Klaxon horn of which I have seen hundereds of at swapmeets ( and bought a bunch of thinking they would fit). Does anyone have a Klaxon application guide or some other info that will help solve this once and for all?

[Guest Bob Kerr]

Just to add, I have had this car since 97 and found only 3-4 parts for it since then and very little info.

[Guest oldsmobile1915]

I'm curious to se what you find out...

Thanks