I was in Ace Hardware today. They had LOTS of things that I looked at, but I don't recall seeing what you are looking for.
Would they be an easy item to make? Seems like if you took one into Ace or any other hardware store, they could gather the stuff you need to make a few.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.