I'd try a place like Toys For Trucks to at least try to find out what kind you have. Then the glass replacement would be the least expensive. If you wanted another cap, you might look on used car and truck sites like Autotrader.com. I had an aluminum cap on 'Ol Blue and I wanted a fiberglass one instead. I found one the exact color on a used truck on a car lot and they sold it to me for $75.00. Caps don't kick the price of a used truck up much. Lenz Truck out of Fond du Lac never shows trucks with caps and they could probably give you some leads on where to look for a used one.

My other auto is a .45

The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory