My small turbo Escort Cosworth is fitted with a momo steering wheel, how ever i was wanting to fit an original one with air bag.

I bought a steering wheel and was told it was a ST escos one, when fitting it everything lined up, and the steering lock work but the two prongs from the indicator stalk never touched the back of the sterriing wheel, so the horn push button would not work?

Does anybody know if maybe ive bought the wrong steering wheel or do i have a different problem?

Thanks