Here are my NATO cans, spouts, carry trays and straps.
(sold as fuel cans but in green?)
I know not plastic as Sceptor(?), but new!
For silent travel I will rubber mount the carry tray and strap where it goes over the top of the can.
Probably not on my van (!), but on my Toyota 4x which has a smallish tank.
Cheaper Than Dirt for the cans (not always in stock), and the HQ Company for the spouts.
HQC has a good selection of various spouts for various cans I thought (I hope that helps answer your question Roonie).
Cheers