slant six dizzy problem

I bought a new dizzy from Oreilles and I have not had too many problems with anything from them till now.

The new dizzy does not have a tab for the hold down .......do I need to find that piece off another old dizzy or did I get the wrong part??

I told the guy at the store who ordered it .....1972 dodge dart demon with a 3.7L Vin code C