I checked the Cessna Parts catalog for P337's and they did install cargo pods on P337's (ref figure 149 of P337 IPC). Since our pod is dimensionally identical to the Cessna pod, adding the P337 to our STC effectivity is not a problem.

I would probably revise the Cessna installation instructions to require small doublers at the attach points through pressure skin (forward attachments).

Regards,

Ray Torres
RT Aerospace