Pinion Seal, and Axle Seal help......

I've got an 8 3/4 Dana Sure-Grip Posi Track rear end(with a 742 center section) with Moser 30 spline axles. I've recently developed a leaky axle on the passenger side, I'm not sure as to what seals are currently on their.

Where is a good place to shop for the seals and is there a specific kind I need to get? Right now I've got Green Bearings on there.

My Pinion seal is also starting to leak, now do I need to get one for a 742 center section? (this one:http://chucker54.stores.yahoo.net/nat834742cas.html

Or no?

Any help would be appriciated.