1- 2 part bowl seals have changed over the years and have lead to much confusion over what seal should be used on what model toilet.
    All vacuum toilets should use #385311462 seals
    All traveler toilets can use 385316140 but newer models without drain holes in the bowl    (2001 or newer) should also use the newer 385311462 seal without drain holes.
Some owners manuals call for the 385310677, this seal is no longer available and you should use the 385311462.

2- The old Lessen motors are no longer available. (310245 12Volt and 310246 24Volt)
    You will need to upgrade using the Whisper Motor upgrade Kit which includes a new  motor,  bellows, 2 bellows clamps and o'rings. All these parts need to be installed because the whisper motor has a longer throw and the old bellows would bottom out in the pump body.
12 volt upgrade kit 385311423 12 volt
24 volt upgrade kit 385311424 24 volt