I have used these quad-rings in my own 760's and they fit perfectly and function just like the original. I am not running a business. I am just a hobbyist that restores Crosman 760's. When I find a part that works I offer it to other hobbyists.
Questions:
Why 2 quad-rings? These gaskets are a pain to get seated properly, I suspect some people will damage at least one ring and its always nice to have a spare.
Why am I just selling the quad-ring and not the other o-rings? In my experience, the problem on 760 air guns is usually the quad-seal. The quad-rings are hard to find. The other seals are simple o-rings that you can probably find at Home Depot much cheaper than I can sell them and you might not actually need to replace the o-rings.
(Tip: Go to Home Depot and search for #6 O-ring, #7 O-ring and #9 O-ring)
General Tips:
Do yourself a favor and get at least 2 dental picks before you start, A nice sharp one to remove the old ring and a flat bladed one to nudge the new ring into position.
Do NOT attempt to remove the metal washer-like piece on the bottom of the Valve Cap to make it "easier" to install the quad-ring gasket. You will destroy your Valve Cap. You have to finesse the new quad-ring into the slot under the metal washer.
The old quad-ring is often stiff and brittle. It might break when you try to remove it. Make sure you get all of the pieces out of the quad-ring channel. I once spent 45 minutes trying to get a quad-ring to seat only to discover there was a chunk of the old ring in the channel.
Message or email me if you need help.
Shipping is free via USPS first class mail in a regular business envelope. The shippers charge a lot for sending anything with a tracking number. I just don't think the risk/reward is there for such a low cost item. However, if you want me to send this to you via some method that includes a tracking number and/or insurance, I am happy to ship by any method you would like as long as you are willing to cover the extra cost. Just email me and we can work something out.