X6 UltraBase with X61s - laptop won't fit

[yalej]

My wife has a X61s. I ordered an X6 UltraBase for it, but the little tabs at the front of the base are completely mis-aligned with the little slots at the front of the laptop. Consequently, the laptop does not fit. I don't think it's me being inept either.

The P/N on the bottom of the base is 42X4323, but I have done some searching on the net and there appears to be another part number, 41U3120. Interestingly, the base has both of these numbers as bar codes stuck on the bottom, but the P/N written on the Lenovo badge is 42X4323.

I guess my question(s) are:

Is there a difference between X60's and X61's in terms of ultrabase compatibility? Could someone with an X61s (or X61 I guess) that has an ultrabase confirm for me the P/N on their base? I'm going to RMA the one I ordered, and I don't want to screw it up again.

Thanks guys.

[Harryc]

You have an X6 Ultrabase for an X61T (Tablet) . You need a non-Tablet X6 Ultrabase. They are different.

[yalej]

Ah, thanks. You're absolutely right. Sadly my fault, since the place I ordered from did say Tablet. Sucks to be me.

The correct part number turns out to be 40Y8116.