I have the WD4050 and use the car nozzle. Seems in the store they have the smaller 1-1/4 and larger 2-1/2. I'd like to get a new nozzle but unsure where you get it from.
check this out and if you find what you want, go to home depot and you can buy some of the accessories separate or as a pack (like below, but make sure that it is compatible with your vac).... click on "wet/dry vacs" on the upper right corner...Welcome to RIDGIDParts.com
If you pick up the commercial hose (Model VT2570) you can use the 1 7/8" accessories or your 2 1/2" ones that most of us have a ton of. Also, the hose is more managable than the O.E. hose. ... just another option. Good luck.
I bought a Rigid car nozzle to use with my 1.25" shopvac and that was a no go. I didn't realize the rigids are 1 7/8". I really wish Shopvac had a nozzle like this as I find that the "guzzler" nozzle is sometimes too big in certain areas of the interior.