Ron in California

Welcome, nice looking car-- you'll find a a few fanatics when it comes to those cars-- the boys down under are in a class by themselves for the 60-62 valiant.

you can try taking out the back seat & crawling through the trunk area(very tight area) & will have metal supports in the way-- or a local lock smith might get you in fairly cheaply.

Good luck & post up some wants /needs. Hopefully your car has the front spears for the fender trim & the U jamb door weather strip-- almost impossible to find.

the pictured car used to be my daily driver-- it is still driven in town today.
Lawrence