New Somfy Roller Shutter Motor Altrincham

We arrived at a customers home based in Altrincham,WA124SL. On attending the house we removed the canopy of the roller shutter. The Top straps are ok but when we take the door up it stops and comes back down. It f you take door up and manually help the motor it will work. The motor needs replacing with new somfy motor. The barrel is 60 mmhex tube and door is 2400w x 2300h.we only have 30mm between end plate and barrel. new somfy motor required