The 1100B7X1/8 and 1100B7X3/16 look suitable for things like our I/O engine cowels, etc....
https://www.trimlok.com/They sell smaller quantities through Austin Hardware as well.
Austin Hardware
www.austinhardware.com4302 Industrial Street
Rowlett, TX 75088-7713
(972) 475-0112
Austin hardware has the 3/16" like above, for $1.66 per foot.