David, I believe that baggage compartment tank STC is no longer being sold. However, the Flint Aero wing tanks are still being sold and installed.
The baggage compartment STC used to be held by a company known as O&N Fabrications. They did a lot of work with auxiliary fuel tanks in a lot of models. What they were really known for was taking a P210 airframe and mating it up with a turbine. It was called the Silver Eagle. Anyway... O&N went out of business a few years ago and Griggs Aircraft Refinishing bought them out. Yes... the same folks that painted Woodstock. Anyway... they bought out all of the STCs that O&N held and are still currently selling them.
Here is the link to the STC page -
Griggs Aux Fuel Tanks [
griggsaircraft.com]
