Differential pinion solid spacer questions

So my differential pinion seal is starting to weep under the driveshaft flange.
This happened about 13k/3.5 years ago. Until it suddenly went from a weep to a full blown diff fluid piss-fest.
I had a hell of a hard time finding the right oem pinion seal because of my 4.88's, so we used a Napa seal-and here we are...
I was able to find the correct oem pinion seal after the job was completed. When we did the pinion seal we reused the pre-load crush spacer, my buddy helping me was able to wing the preload using the old spacer. Which I know now is a no-no. But it's held up this long.
So my questions are:

• Where is a good vendor I can order a quality solid spacer from? That'll work with 4.88's (if that matters)?
• Is this a job for a diff shop or dealer? Or can I do this at home? (I know little about diffs)

TIA

 

These guys are awesome http://eastcoastgearsupply.com/i-126833-toyota-8-v6-turbo-e-locker-solid-spacer.html

You can also call them and tell them what you are doing and they can probably walk you through the whole process.

 

The guy who did my rear regear and locker is in AZ (Chandler). Check with www.gearinstalls.com
He'll put you on the right track
I did get my gears from justdifferentials. com
I've heard good things about ECGS that Noah mentioned

 

http://www.justdifferentials.com/Default.asp - call them up ask for drew tell him i sent you, and he'll hook you up. JTs is basically Nitro Gear and Axle.

 

Awesome guys! You da shit.