Live and learn. The alternatives aren't great.
Ordering from anyone can get to be interesting. If they and you know what you are discussing all should be fine. If one of you knows the product but the other doesn't life can get complicated. I've ordered from the other side of the world and had no problems. I've ordered from the other side of the Mississippi and had no end of grief. That's why so many people like Amazon and Zappdos.
There are international standards on threaded fittings, but... one has to read and understand the specifics. For CO2 - in the USA - its CGA-320 on the tank side. In Asia it isn't.
Read the description and if in doubt - ask the seller or distributor.
All the eBay ads for JBJ bubble counters - that I took a quick look at - say what regulator they fit. I didn't look at all the ads.
Clippard solenoids can be ordered from Clippard or any number of pneumatics suppliers. Rex provides (or provided) a service by eliminating everything other than what people needed.
Post your regulator details - or thread sizes if you can't find model numbers - and someone should be able to offer more help.