Can anyone tell me the proper specification and/or model number for the front tyre inner tubes?

While at Morgans West, they stressed that the tube was different than typical tubes in that the air valve was different (in its shape or position).

I searched the forum, but couldn't find a specific enough reference so that I could check for the tubes online.

If you have a link for a U.S. supplier, that would be best -- but anything would help.

Thanks,
James