I am replacing both of the axles in my 94 1.9L car. I picked up the reman units from AutoZone today and noticed that the longer axle (passenger side) is missing the little rubber damper that is in the middle of the OEM axle. Is this something that is needed or not? Also, is it necessary or recommeneded to replace the axle oil-seals on both sides when doing this job. I looked through both of the shop-manuals that I have and neither one mentioned anything about this. It seems to me that this part should be changed while it is convenient to avoid leaks. When installing a cam or crank you always replace the oil-seal, right?! Any thoughts? Thanks!