Replacement neutral saftey switch

Short story long. In the process of rewiring my 73 duster everything done motor/gauges/charging system. Go to fire it up no dice. No continuity between nss middle prong and ground in park/neutral. I bought a new switch from rock auto standard motor products ns11 change it out with a bucket underneath doing the old nascar pit crew Maneuver, trying not to make a bloodbath of the garage floor.
Anyway i tested the new switch before hand on the bench with the ohm meter everything was good but if i tighten it anymore than 2 or 3 threads by hand it goes south, theres no continuity between reverse light pins. The switch is obviously longer not allowing the plastic plunger to come out for the reverse light portion. is there a better source for these than standard motor products? In the mean time ill tighten it up and carry on, but id like reverse lights to work off the transmissions switch.

Tldr. Replace nss with standard motor products ns11, switch obviously longer in transmission body portion, reverse lights dont work when switch tightened, need source for one thats not chicom.