I bought the same AUG after accumulating some hard-earned adventure points in MMC, or rather I wanted to buy it for my 39 Ranger when I saw it on the merchant's list. But before I bought it (40 pts. I think), I made sure that I could equip it to something. Needless to say none of the equipment I had at the time had any TYPE 3 Aug slots. So I left it on the LDoN wishlist for a few days.
So I took my little woodie butt over to the ancient land (Takish Hiz) and I earned a few adventure points there. Only having like 12 points there in North Ro, I looked at the merchant and what did I find? A Sculptor's Hoop with a little AC and a little stat buff, and...and... HOLY CRAP!!!, a TYPE 3 Aug slot. This was perfect because the Hoop was only 10 adventure points.
So... to make a long story short : do a little research at some of the camps for the Aug Slots you have a hard time fitting, most likely one of the other LDoN merchants has a piece of equipment for that Type of Aug. I know there is a system for what types of augs go with what kinds of armor (LDoN, Velious, Kunark, etc.), but i don't know it. If anybody has a link or some basic info for that, it'll probably help too.
And by the way... that Sculptor's Hoop with the Crumbled Gravestone of Renewal looks REAL good on a handsome Ranger like myself. Could look nice on a Pally too, eh?