I get mine for "almost free." In 1/72, they come in the Fujimi KA-6D kits, so, for each Tanker I bought, I got a D-704 for a Skyhawk, Corsair II or Skyraider model.
I will only ever need one for a KA-6D, as I intend to model only one of the Tankers with the Pod mounted for a back up.
I didn't realize that you already had the basket in the Steel Beach line, Darren. As you might remember, that is not my scale. I do think that a lot of people are going to want your improved part as a separate piece, just so they can finish a tanker sitting on the wheels. That is unless your whole set is better than the kit parts, of course.
Rex