Rear axle ID

[jeffs55]

Here's a couple pics of my rear axle. I think it's a 8.5 10 bolt. I want a posi, limited slip, locker or whatever for it.
Any thoughts, comments, suggestions? Besides the fact it needs gaskets and seals...
http://pic1.picturetrail.com/VOL1135/4322794/9103947/290629141.jpg
http://pic1.picturetrail.com/VOL1135/4322794/9103947/290629137.jpg

[D.S.]

http://i8.photobucket.com/albums/a44/davtom/rears.jpg

Don't take these pictures as gospel, I have seen 8.5 rears with the pointed lugs like in the pic to the right but the cover was more round like the one in the middle...

[jeffs55]

Thanks DS. I finally got out and measured the rear.
Flange to flange (without drums)
59".
I looked for a ID no. stamped on the passenger side axle tube.
It's either painted over or welded over. I couldn't find one.