I have not seen any.
Are you trying to get in a storage building? How narrow do you need? If you fold the outter mirror part in you might gain one or two inches per a side? I would think you would need 8 foot wide to be safe so I'm pretty sure your mirrors would clear that (esp when mirror is fold in some).
Perhaps an aftermarket company may offer something but you might loose the Mirror cameras.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.