If I had the tube I would give it to you.
If you want drive over to my house one day this week we can make a block off plate till you get a tube. Parts like that are usually hard to find. And you can see what the mileage difference is. I have seen mileage increases but everything is different. Just let me know. I have thursday open till about 5 pm.
Or bring your old tube and I may be able to fix it.