Question 1

Will this tray fit onto the MB991"SK-B" mobile rack?

It only lists the "IK-B" as compatible.

Accepted Answer

Per the details in the overview, it states:
Compatible hard drive caddy (tray) for ICY DOCK MB991, MB994 Series 2.5" SATA / SAS internal mobile rack RAID backplane.

I would be hesitant the try any other rack as not only does the tray have to physically fit the rack, the connectors must line up correctly and the tray should be able to be secured or locked in place.
That being said, and without going to Icy Dock's support, the tray appears identical to the one under discussion. And the overview doesn't get into specific compatibility beyond the basic MB991IK___ MB994SP series, which covers a lot of different models

Probably worth a shot given the price.

Question 2

Will this tray fit MB9941PO-3SB?

Accepted Answer

Hello, Thank you for contacting us in regards to your question. The best way to confirm specs is actually by checking the manufacturer's website. With many of our products you can click on the "Warranty & Returns" tab and you will find the Manufacturer's contact info, including the manufacturer's website. According to ICYDOCK, this tray is supported for use with the MB994IPO-3SB. https://www.icydock.com/goods.php?id=125 Thank you, Newegg Support

Brand	ICY DOCK
Model	MB991TRAY-B
Color	Silver

Conversion Tray	Tray for ToughArmor (MB991, MB994) Series
Mobile Rack Drives Support	1 x 2.5" Drive to 3.5" Bay
Mobile Rack Interface	2.5" SAS & SATA I / II / III hard drive and SSD
Protection Case	Single Drive
Specifications	HDD Interface: 2.5" SAS & SATA I / II / III hard drive and SSD Drive Height: 7mm, 9.5mm, 12.5mm, 15mm Data Transfer Rate: Transfer bandwidth up to 6Gb/Sec Structure: Plastic and Aluminum alloy Compatible ICY DOCK Model: Single Bay Model: MB991IK-B Multi Bay Model: MB994SP-4S

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ICY DOCK MB991TRAY-B 2.5" SATA / SAS Drive Tray for MB991IK, MB994SP Series

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Item#: 9SIA8N278F2510