Re: Fake oil tank
A 6 inch long piece of thin wall PVC pipe and 2 end caps would do real nice for this type of storage container and could probably be built for about $5.
Glue one cap on and leave the other side to just push on - pull off and if it was to loose it would be very simple to make a small latch or retainer to keep the cap from vibrating off.
then paint it to desired color and BAM....! there ya go!
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!