Complete adapter assemblies:

Requires Aero Pack retainer or tailcone on rocket to retain adapter.  Adapter retains smaller motor from moving forward or backward.  Adapters nest into each other.  Adapters come assembled and ready to use.

A2938 Adapter - 29mm to 38mm        $26.00

A3854 Adapter - 38mm to 54mm        $39.00

A5475 Adapter - 54mm to 75mm        $48.00