PCMCIA question.

Hey guys,
I have an old laptop which dosn't have usb. I've found a number of usb PCMCIA cards with 2 usb ports on eBay but i'm not sure on one thing. My laptop has a 32-bit PCMCIA slot. On the PCMCIA website they list 3 types of PCMCIA, 16-bit, 32-bit and a new type for USB2.0. The PCMCIA cards I have found all support usb2.0 so I guess that means they are the new type of PCMCIA card. Will this type work in my laptop which only has a 32-bit PCMCIA slot or will I need to find a 32-bit usb PCMCIA card? What confuses me is that on the PCMCIA website they refer to the 32-bit cards 'CardBus' and the new type as 'ExpressCard', the usb2.0 PCMCIA cards on eBay are also CardBus.
Cheers