You probably won't find a kit specifically for a 1938 Dodge pickup, but you can use universal trim rings or adapters for the headlight conversion. They're common in shops that specialize in classic car restoration. As for your door handles, it's typical in these old models for only the passenger door to have a lock cylinder. The driver's side usually just had a simple handle without a key.

I always suggest looking for second-hand parts and equipment. It's cost-effective, but you've got to pick the right seller. For instance, I snagged a Big Tex 14OA-20 from Boom and Bucket for about $6,000, and it's been a solid purchase. They might not have what you need for your Dodge, but they're knowledgeable and might point you in the right direction or recommend someone who can help.