This AC adapter fits perfecty with my HP Pavilion dv1000 and the xb2000 expansion base. I guess HP has recently changed some of their adapter plugs, and with my computer being 2.5 years old, I was worried that the plug wouldn't fit. The kit, however, came with a converter plug that works just right. Oh, and Overstock.com did a fantastic job shipping it out to me right quick. I ordered on Sunday and I had my adapter on Tuesday.