Fuel Cans

I agree with model maniac 96.  1/32 and 1/35 mix and match just fine.  I have mixed 1/32 aircraft, helicopters, and civilian vehicles with 1/35 armor and figures often.  As long as you keep constant items such as weapons or canteens in the same scale, you will be fine.  You can even mix 1/35 and 12/32 figures so you have some variety in size.  Again, just keep constantly sized items in the same scale.

J G Miniatures makes a line of accessories that are scaled at 1/30.

If you can find some of the older Monogram armor kits in 1/32, they have jerry cans. Its an easy enough cast for your own use.

Dig through some of the Forces of Valor kits. They are scaled at 1/32 and the armor kits often include jerry cans.

1/35 is almost the same thing as 1/32, you could probably interchange them, unless you want your dio to be 110% accurate, nothing wrong with that though.

Jim