Finding correct 3/8" Keystone (Oetiker) clamp size?

I want to put a Keystone clamp on the rubber fuel line (3/8") going into my 440 fuel pump. From Jegs I ordered their 3/8 keystone clamps figuring these would be correct, and they're not (too small).

Using my calipers, I measured the thickness of the fuel line on the fuel pump and it looks to be 0.660, so I'm guessing when looking for a Keystone clamp I will need one that is roughly 0.660 when compressed.

Or is there an easier way to find them. I refuse to pay YO's crazy shipping prices for their Keystone clamp ($6) when I can probably find the clamp at an Ace Hardware for a $1.

TIA.

Check out this place: https://www.kegoutlet.com/oetiker-clamps.html
I have the tool, which I'll send to you to use. Just put it in a padded envelope and send it back for a couple of bucks when you're done.

Dave, thanks for the link and tool offer. I have the crimping tool, just need to find the right size clamp.

You will have to order for the hose OD. Had the same problem finding one for a EFI pump and ended up using a regular EFI worm fuel clamp.