528i:

https://www.imcdb.org/vehicle_1767572-BMW-5-F10.html (2011+)
https://www.imcdb.org/vehicle_1912535-BMW-5-F10-2011.html
https://www.imcdb.org/vehicle_1188117-BMW-5-F10-2011.html
https://www.imcdb.org/vehicle_1237120-BMW-5-F10-2011.html
https://www.imcdb.org/vehicle_1324884-BMW-5-F10.html (xDrive)
https://www.imcdb.org/vehicle_1271594-BMW-5-F10-2011.html (xDrive)
https://www.imcdb.org/vehicle_1382325-BMW-5-F10.html

From what I can tell, the main code is CD539. The letter added after that code indicates which market it is made for. N for North American, X or E for Export, and C for China. So a code of CD539N is a North American model, etc.

The English Wikipedia page has "CD539". If you click on the CD4 Platform page, all four are listed. And then this page, about halfway down, goes into more detail:

https://en.wikipedia.org/wiki/User:KA467/Ford_development_codes

There is apparently an alternate code of CD389 used on the model as well.

I guess it depends how detailed we want to be with them. Technically, only the North American models should be listed as "CD539N". If you want to be able to separate each regions models, we should add the letters. Or keep it simple and just use "CD539".

I think the ones marked "CD53N" were a typo that somebody keeps repeating. If you do a search for that code and Ford Edge, it only returns links to our site.

The Chinese ones might be worth keeping a separate code, as they also include the China-only 3-row Edge Plus.

For Chrysler/Dodge Viper.
https://www.imcdb.org/vehicles_make-Dodge_model-Viper.html
https://www.imcdb.org/vehicles_make-Chrysler_model-Viper.html

For all 1991-1995 Chrysler/Dodge Viper, chassis-code is "SR I".
For all 1996-2002 Chrysler/Dodge Viper, chassis-code is "SR II".
For all 2003-2006 Dodge Viper, chassis-code is "ZB I".
and for this:
https://www.imcdb.org/vehicle_158002-Dodge-Viper-SRT-10-2007.html

For all 2008-2010 Dodge Viper, chassis-code is "ZB II".
For all 2013–2017 SRT/Dodge Viper, chassis-code is "VX".
https://www.imcdb.org/vehicles_make-SRT_model-Viper.html
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=2012&yearTo=&makeMatch=- 2&make=dodge&modelMatch=1&model=viper&modelInclModel=on&modelInclChassis=on&mk=&origin=- &madein=&madefor=&role=

Source:
https://en.wikipedia.org/wiki/Dodge_Viper

We have 2 Ford Edge with chassis code CD539, 88 with CD539N and 41 with CD53N.
Is there a reason for these three different codes?
https://www.imcdb.org/vehicles.php?make=Ford&model=CD539&modelMatch=2&modelInclChassis=- on
https://www.imcdb.org/vehicles.php?make=Ford&model=CD539N&modelMatch=2&modelInclChassis=- on
https://www.imcdb.org/vehicles.php?make=Ford&model=CD53N&modelMatch=2&modelInclChassis=- on
CD539N is the only one mentioned on the Wikipedia page

For the Supra it is widely used

Yes, it's a fan thing. I remember a "Mark" was added on Eclipses, Priuses and Supras, because "that's how their fans refer to them". On Eclipses, the "Mk" was quickly changed to "G" (1G, 2G, 3G, 4G) because that's the formulation they used in Eclipse forums. I can't argue with that, but I'm glad it hasn't been expanded to other japanese cars. For some models it would be a minefield.

Yes, that one is big.
I changed the three to MPV.

Okay, now I think maybe it really looks too large to be a hatchback

I think they should be changed the other way...
Wikipedia lists them as mini-MPV:
https://en.wikipedia.org/wiki/Nissan_Note
https://en.wikipedia.org/wiki/Nissan_Livina
The Note is related to the Renault Modus that we listed mostly as MPV:
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=renault&model=- modus
(and that Wikipedia also lists as mini-MPV)

Both Nissan Note and Livina are hatchback

https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Nissan&model=- Note
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Nissan&model=- Livina