Amazon.com: Silverstone Tek Slim ExpressCard/34 USB 3.0 ExpressCard Adapter (EC02) : Electronics
2 Port USB 3.0 ExpressCard 34 Adapter MacBook Pro 15"/17" *OS X Native Supported | eBay
Amazon.com: Xiwai ExpressCard 34mm to PCMCIA PC CardBus Card Reader Adapter USB for Laptop : Electronics
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StarTech.com ExpressCard 34mm to 54mm Stabilizer Adapter 3 Pack Install a 34mm ExpressCard into a 54mm ExpressCard slot without card slippage expresscard 34 to 54 adapter expresscard stabilizer expresscard bracket - ODP Business Solutions
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Sonnet Echo Pro ExpressCard/34 Thunderbolt Adapter ECHOPRO-E34
Active CardBus to ExpressCard/34 Adapter
2 Port SuperSpeed USB 3.0 (macOS Native) ExpressCard|34 Adapter – local338