There is a HP highest-quality 5.25"-to-3.5" toolless adapter that I like the best that the 3.5" media card reader can be mounted into at about 10.00 including shipping via an eBay search currently for "New HP 3.5 Media Device in ODD Bay Carrier 3.5 - 5.25 Media Converter 468770-001". These also are no longer available from HP PartSurfer. The 3.5" card reader has 2 threaded holes along each side to accept HP silver shouldered non-metric screws (5/32 national coarse I believe) and that slides down and then forward into the adapter perfectly, clicking into place. The green plastic button allows release to slide backwards and up and out if needed.
The 19 pin plug he mentions fits in the standard "USB3 motherboard-type header" that is available at the rear of the HP "2x2" TI-chipset PCIe card I show.... it is actually a "2 x 10 header with a 1 pin blank".... very much the standard for these. If you look at the StarTech card reader you'll see a front dedicated USB3 port at the bottom right face of the reader, which runs straight to the "2x2" PCIe card in one of the 2 blue cables, and the second blue cable fed by that plug is only for the media cards. The HP USB3 media card reader I referenced uses only one of the 2 possible USB3 channels so its data cable is less bulky. The HP media card reader's cable length is perfect in the Z420 build I show, with the card reader sitting in its adapter in the lowest of the three 5.25" bays.
5.25 Media Dashboard Driver
To accommodate varying driver sizes, Freightliner has equipped its cab with throttle, brake and clutch pedals that can be moved three inches up from the standard position toward the driver. The foot pedals can be controlled by a dashboard switch. 2ff7e9595c
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