2001 CV Axle replacement

I changed the CV axle on my 2001 Tacoma today and used this thread as a guide.
http://www.tacomaworld.com/forum/technical-chat/21192-how-change-cv-axle-01-04-add-tacoma-2.html


It was very helpful, everything was pretty close to what was posted. One thing that wasn't the same tho was a metal piece at the upper end of the axle that goes up to the differential kinda like another seal or spacer. It didn't come with my new one tho so I was just wondering if I did the right thing since I took it off the old one and put it on with the new one. The axle went in ok, but it is leaking a few drops after I put it all back in. Quite a bit of diff oil came out when I was changing it so I'm hoping that is the reason why and not that I used the metal seal (spacer).

Anybody have any insight?

 

Any word on this? I'm pulling my cvs out now