Fuel tank caps for kz650D

Hi all! brand new here, and have a 1978 KZ650 I just recently acquired that I'm working on. one of the things I need is a fuel tank cap. When I've looked at parts websites, the diagrams just don't look like my fuel tank. Here's how mine looks.. any advice on where to find this?

Welcome to KZr Xenophon.

I just happen to have a '78 KZ650-D (SR) model that I recently stripped to the frame.
I have the gas cap, but will have to check tomorrow eve to see what kind of condition it's in.
I'll post here tomorrow when I find it.

Part # is 51048-1001. Bikebandit shows it for $75, but I doubt they are still available new.

I checked Bike Bandit, and they informed me they no longer have them available..

Checking with one of the local salvage yards....

Right now, I'm using a bath drain plug

now thats custom!

mr anderson wrote:

now thats custom!

Hey, It works, and its what I have on hand till I get the right part....