Longe range ferry tank used on P-39
 

Hi all,
I'm looking for pictures/information on the big under-belly ferry tanks used on the P-39 Airacobras ferried through the Lend-Lease routes to Russia. Are there any surviving examples in exhibitions? I'm especially interested in any information on the panel lines/the surface details of these ferry tanks.

Thanks a lot for any help!!

Olli