Best option is to use a USB connected drive.  The Dell hardware (chassis/case) is, in most cases, specifically configured for how it was ordered new.  Its why, even though I'm an old Dell customer, I have a home built desktop for my recording studio.  Dell's top line XPS model could not be configured, after purchase, to add what I needed.

The model with the drive has different faceplate.  I doubt dell sells this.

There is also a bracket that attaches to the laptop style drive.

My suggestion would be SPECIFIC USB 2.0 Drive which allows reinstall of windows on any dell.

https://www.bestbuy.com/site/lg-8x-external-usb-2-0-blu-ray-disc-double-layer-dvdrw-cd-rw-disc-rewriter-black/9243009.p?skuId=9243009

This drive works with OEM System Builder DVD disk for reinstall on any dell that supports F12 booting of windows 10.

https://www.newegg.com/microsoft-windows-10-pro-64-bit-reinstall-recovery-disc-only-no-license-key-included/p/N82E16832350238

It also includes Cyberlogic Power DVD with playback codecs that are removed from windows 8 and 10 for the same cost as the software alone.

I agree with fireberd suggestion to go with the external drive. A standard half-height optical drive would probably have better performance than the quarter-height drive that comes from Dell.

For a lower cost and better performance you could purchase an USB 3.0 enclosure for a SATA DVD drive and a half-height DVD burner.

https://www.newegg.com/p/1B0-00VE-00013?Description=dvd%20sata%20to%20usb%20enclosure&cm_re=dvd_sata_to_usb_enclosure-_-9SIAHBU9ZA3911-_-Product

https://www.newegg.com/lite-on-model-ihas124-14-dvd-burner/p/N82E16827106393?Description=dvd%20drive&cm_re=dvd_drive-_-27-106-393-_-Product

I was sure it was too much work (especially since front bezel needed)...I'll just get an external usb. Thanks!

I have several SATA drives sitting around; will connect to SATA drive caddy or just buy an external one.  For what I need a cheapie will do.   Thanks!

Call Dell Small Business Support (you will reach someone in the US) and you can order the correct front bezel with a cut-out for an optical drive and the optical drive bezel.

HVNK4 is just the faceplate to the laptop style  9mm to 12mm drive.

https://www.ebay.com/itm/GENUINE-DELL-XPS-8930-BLACK-OPTICAL-DRIVE-FACE-PLATE-COVER-HVNK4-0HVNK4-/163793883213

RRVY9 is the faceplate with Opening.

https://www.ebay.com/p/25035264106

Neither part  includes the Sata Data Cable or the bracket that screws into the drive that holds it in place.

https://www.dell.com/support/home/us/en/04/product-support/product/xps-8930-desktop/docs

https://topics-cdn.dell.com/pdf/xps-8930-desktop_service-manual_en-us.pdf

https://www.dell.com/support/manuals/us/en/04/xps-8930-desktop/xps-8930-service-manual/procedure?guid=guid-641f4691-9950-4f6c-a322-46158a5616e0&lang=en-us

Typical drive is 9.5mm   0H2YKY Toshiba Samsung SU-208 Super Multi 8X DVD RW DL Burner 24X CD-R

https://www.amazon.com/DVD-RAM-Internal-Tray-Loading-Optical-Replacement/dp/B07ZTR4BM2/

5.25 inch optical drive does not fit into an 8930 so that suggestion is nonsense.

what is the usage needs that is first. (application and usage) vast. on ODD.

burning disks. CDr and DVDr?

burning BLueRAY.?

or just watching DVD movies ?

but yes a USB HDD  for $15 works , works on all PCs ive ever tried, heck mine even boots. that is right.

This best but what you do matters most.  usage.