Purchase the lastest edition of "Hemmings Motor News" from your local news stand or visit their web site. You will find many venders out there that sell parts for your 65 pickup.
You can find one on eBay.com for a reasonable price.
How do I release the frozen brakes on the drum of a 1965 Chevy 3/4 ton pickup
Yes they do.
Lower left of radiator.
In most vehicles, you will find the drain valve at the bottom of the radiator. Look on the bottom of the radiator on the driver's side of the truck. It is a small plastic hand operated twist nut.
On older vehicles many forums host downloads for service repair manuals. To find a wiring diagram on a 1965 Chevy Pickup truck search on Chevrolet Classic truck forums.
Any auto parts store can help you with that.
How do you flush the raditor on a 1992 GMC Sonoma Pickup.
Look at the bottom or rear of the radiator
That is the item that is between the radiator and the grill, It covers the front of the radiator.
bottom driver side. access from top of radiator.
Bottom of the radiator.