Your chair has the same seating as my 700.
https://www.wheelchairdriver.com/board/ ... 33#p171026Read carefully!
There are several arm tops, and several uprights.
The ones that swing back out of the way are the worst and wobble back and forth...
The ones that lift up and are removable are the best. But again not very solid. So I reversed them, and fitted 2 each side. Lots of messing around and once done much better!
Where from? Sunrise.
You need an extra bottom mounting for each side, and 2 left and 2 right arms uprights complete. And may need minor surgery to joystick and switch mount if fitted. It all JUST fits into stock arm tops. And causes severe headache assembling it all.
https://parts.sunrisemedical.eu/indexuk.phpRead small print login as guest, look at Q700R armrest part numbers.