Regarding the PN motors, if it has a flat belt motor, use a flat belt replacement motor, the geared version has some electronics that go with the geared setup to prevent it from tearing the belt to shreds if the brushroll is jammed or the motor is overloaded, if you just went and put in the geared motor (and corresponding brushroll) alone, then you could end up causing damage to your PN...
Parts and peripherals are available from Tristar (The Comapcts to DXL seem to come under the EX20 category), saves messing about with ebay auctions:
[URL unfurl="true"]http://www.tristarvacuumscausa.com/shop/cart.php?target=category&category_id=67[/URL]
