Gom, a close look at that cap shows it's more of a true eraserhead than the factory classic (i.e., cat's tongue) cap. It's smooth all of the way around, has a sharp edge and a flat top. After viewing hundreds of photos on eBay I could not find a matching cap. Maybe ask the eBay seller of the X60 where it was purchased from?
Ray Kawakami X22 X24 X31 X41 X41T X60 X60s X61 X61s X200 X200s X300 X301 Z60m Z61t Z61p 560 560Z 600 600E 600X T21 T22 T23 T41 T60p T410 T420 T520 W500 W520 R50 A21p A22p A31 A31p NOTE: All links to PC-Doctor software hosted by me are dead. Files removed 8/28/12 by manufacturer's demand.
I bought this on eBay advertised as new open box . Instead, I got an obviously-used intermittently-working keyboard. Seller refunded and this left me...