Most IBM's used CPU modules, but IBM won't say if it's a standard part or not. So I suggest you look at <A HREF="http://www6.tomshardware.com/cpu/00q4/001107/mobilecpu-07.html" target="_new">http://www6.tomshardware.com/cpu/00q4/001107/mobilecpu-07.html</A> to see if it's a Mobile Module 1 package, you can find replacement CPU's in this package for both Pentiume and Pentium II types at Pricewatch.
What's the frequency, Kenneth?