Sure.
Short gun and nozzles. I use green for the pre wash and to wash off the snow foam, white for the wash rinse and final once over and sometimes the black for a lighter sprinkle. Colours are pretty generic in relation to nozzle degree whatever brand you get.
Short extension lance. Allows me to get in a little closer and under the arches.
https://www.ebay.co.uk/itm/333405357937 47.5cm with sliding grip. I can stand further back for a powerful wash, great for larger vehicles with a higher roof. I tend to connect the shorter lance too so I get the angled spray. If I don’t, I make sure I hold the lance at an angle.
With that set up, I can use just the gun (great for wheels) right through to any combination.
You’d obviously need to get one to fit your pressure washer connections and apparently they are rated for machine models like K2-4 and then K5-7.
Word of warning...........make sure the nozzles are inserted and locked in place before directing it at your car or anyone, or else you’ll regret it when it flies out and causes damage. I always point it away and downwards to test. Also, don’t use the red (zero degree) or orange (15 degree on paintwork)
Before upgrading to my K5, one of the best purchases I made was a 10m high pressure hose as the horrid standard Karcher 6m was awful. Not only did it keep on twisting, it wasn’t long enough and I had to drag the unit around. Nice to see the K5 came with a 10m hose.
Lastly, I imagine we all complain about the hose twisting up? I bought a swivel adapter for the end of the short gun, so no matter how I use it or put it down, the hose never twists.
You can buy most of the above as a complete set in various forms and it’ll probably be cheaper. I bought and added to mine over time as I wasn’t sure how I’d get on with it.
Dedicated detailer sites sell all of the above but can be more expensive depending on brands. Fortunately I’ve had no issues with any of mine.
Hope this helps.