I just bought a D it has a 25hp Kohler and the k66 with electric lock. The D has standard headlights not led and no guages.
Bro that explains it I was just at family farm and home and I saw the one with the gauges went and looked and it had smaller but slightly wider tires no arm rests and I do believe no locker bc it didn't have a switch or pedal unless it has a limited slip. I'd save the money buy the d and order the updrade parts online. I just bought a D for $3500 and have the dash gauges Iris box wiring harness and led head lights and brushed aluminum pedal coming for $700. So in the end I'll have like $4200 in it. I have a PDF of the parts list for last year's XD if anyone needs it it was definitely hard to track downI've been wondering the same thing and have been seeking the answers. There's so much conflicting information on their website and online. I did hear back from Husqvarna and was told for 2019 both have the Kohler engine, the "D" has the tuff torq / locking diff, larger tires, and armrests. The 2019 XD has been changed apparently from 2018 and now has the fast hydrostatic (Hydro Gear) and apparently no arm rest(????) althougth that's not what the pic on their website shows. The gauges and led lights remain but it sounds like it may have smaller tires too???
I still can't get 100% confirmation the XD has the locking diff and the arm rests ... Really frustrating.