Never heard of these sleeves, though I get what they are about. Are they then thin enough and/or the seal has enough stretch that the OEM seal still works? ot do you have to get a larger I.D. seal?

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com