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Difference between 34mm & 54mm Expresscard (to USB adapter )

I'm looking at Expresscard to USB 3 adapters for Lenovo X220 laptop.

Q1:
What's the difference between 34 & 54mm? Can both of them
fit into X220 expresscard slot ?

Q2:
I'm looking at the following models:
http://www.amazon.com/GMYLE%C2%AE-ExpressCard-34mm-Adapter-Dual/dp/B0045BLP1S/ref=sr_1_1?ie=UTF8&qid=1356533922&sr=8-1&keywords=Expresscard+USB+3

http://www.amazon.com/HDE-Port-54mm-Express-Card/dp/B0046XUMDW/ref=sr_1_4?ie=UTF8&qid=1356533922&sr=8-4&keywords=Expresscard+USB+3

http://www.amazon.com/5Gbps-BC618T-Laptop-Express-support/dp/B004YB60KA/ref=sr_1_12?ie=UTF8&qid=1356533922&sr=8-12&keywords=Expresscard+USB+3

http://www.amazon.com/5Gbps-BC618T-Laptop-Express-support/dp/B004YB60KA/ref=pd_cp_pc_2

Q3:
Does Lenovo X220 support Expresscard 2.0 & which of the above cards
support Expresscard 2.0 ?

ASKER CERTIFIED SOLUTION

MartKuper

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SOLUTION

Darr247

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Darr247

> Those $1.50 cards might look inviting, but if I bought them
> I would assume I was wasting $1.50 (it would cost more than
> that to ship them back if they're no good)

Cheap electronics *can* work out, too, of course... I have bought some $1 USB bluetooth adapters on amazon that work fine using microsoft's bluetooth stack, with every feature I've thrown at them (especially using my cell phone as a 3G modem, which some built-in bluetooth adapters wouldn't do).

Difference between 34mm &amp; 54mm Expresscard (to USB adapter )

Difference between 34mm & 54mm Expresscard (to USB adapter )