So, I have been trying to install a Pioneer 5.25" BDRE drive in the Dell Pro Max T2 (see attached pic from Dell's website:

I cannibalised the small 9.5 mm one LG BU 40N from my Precision 3680 and replaced the stock DVD-RW drive, which came preinstalled with the Pro Max T2. The SATA power cable in the Promax T2 fits this, and so all is good, but I want to replace the small 9.5 mm drive with the larger 5.25-inch BD-RE drive (I just have it, and I don't want to use the Flex Bay anymore. But I have been unable to find the SATA power cable for the larger drive (it needs the full-size SATA power connector on the Drive side as opposed to the mini one for the 9.5 mm ODD). I pulled the cable from the Precision 3680 (it is a special OEM cable with a special-size ATX connector, which connects to the MB SATA power slot-it's neither mini nor full-size ATX-I tried both- but a weird in-between size!). The one from the Precision fits in the MB slot but doesn't seem to be able to power the larger drive, even though in the Precision, this cable actually had 2 full-size SATA power connectors on the drive end apart from the mini SATA ODD connector, which I used to connect a HDD and a Flex Bay SSD inside the Precision 3680 and it works fine inside the Precsion 3680). Any ideas on where to get a hold of this cable? I searched the usual sites-eBay and Amazon- but no specific hits for the Pro Max T2, and the one I got from eBay was a mini, and the Amazon one was a full-size ATX on the motherboard side-both don't fit. Any help is appreciated. Thank you!

https://www.ebay.com/itm/223132596067

https://www.amazon.com/dp/B0FP59DX74?ref=ppx_yo2ov_dt_b_fed_asin_title