If you look in old farm type tire shops that have been in business for quite a while you can come up with 14 or 15 inch tubes with the bent metal valve stem like you need. They don't make them anymore though. Another option is replacement metal stems that glue in place.
Keep your old liners since you can't get any more of them either. You can take a 16 inch liner and split it and taper the ends to make it work.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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