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January 10th, 2024 17:53
Help finding Dell Flexbay
I picked up a Precision 3660 over the holidays. While outfitting it I came across the hot swap bays Dell makes. I was able to easily locate a drive caddy for 3.5in. But I am having a heck of a time finding the actual flexbay to mount to the chassis.

the image is from the 5860 build page.
from the build sheet;
Upper Flexbay |
No Hard Drive | [400-AKZR]/GMKBO5E |
|---|
But I have thus far not been able to locate this item either by Flexbay or any combo of the part numbers above. Anyone have any ideas?
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redxps630
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January 11th, 2024 18:02
Dell sales chat: We do have the 4RXGJ part in stock
The price is around $14.99
4RXGJ is the bracket
P55XY is the caddy
pic shows there is a 2.5” optional adapter built in the caddy.
Dell stock pic
P55XY
4RXGJ
(edited)
redxps630
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January 10th, 2024 23:40
C7 M.2 SSD Boot + Front 3.5"" S ATA
C7 M.2 SSD Boot + Front 3.5"" S ATA
C7 M.2 SSD Boot + Front 3.5"" S ATA
4RXGJ (or P55XY) is the external enclosure you are looking for, as it says LCK-CVR which may mean lock-cover
this is very expensive on eBay now. P55XY 4RXGJ
(edited)
dummy
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March 4th, 2025 12:21
Thank you @redxps630
Very helpful!
Retired AF
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December 5th, 2025 20:33
Here are two Picturtes that might help with installing the Front Hard Drive Bay.
dsb1829
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December 5th, 2025 20:44
Thanks to the folks who have chimed in. While pictures and part numbers have come up through here and my searching, I have yet to find a site I can buy the chassis components to use the flex bay. Honestly, I just gave up and installed a 5tb in the case and use a 5tb usbC to back that up. After going through Dell support chat and phone without resolution it just seemed I was chasing a unicorn. While I would like to complete this at some point, it just never was a priority.
Retired AF
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December 5th, 2025 20:52
@dsb1829 I purchased the FlexBay from Dell.It was listed as "
Dell Pro Max Tower T2 Removable Front-access HDD.
It cost $64.99 I got two Drive caddies off eBay for around $10.00 eaxh.