It's easier than that. The shower head has a standard 1/2" pipe thread. Get a 1/2" PVC nipple and a regular 1/2" shower hose with female ends. Remove the shower head. Screw the nipple onto the new shower hose and then screw the nipple onto the hose from the mixer. Then screw the shower head onto the other end of the new one end of the shower hose.
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Jack
'01 Ford EB50p Quigley 4WD
Genius. Thx. Btw smb sent me another mixer dial with hose and though it doesn't leak at the dial anymore it leaks from the head. Hairline crack at the shower heads base.