These current works in the Flappe series use Nissan 200SX gas cap lid doors.

Generally I avoid using materials from automobile wrecking parts given that these works are frequently exhibited within atmospherically-controlled conditions in museums and other institutions. As such I avoid possibility of contamination and minimize the use of solvents which would be required to clean off carbon and other pollutant deposits found on used car parts. As of June, 2013, I understand that all the unused gas cap lid doors available from Nissan in North America and Japan are exhausted.