If , like me , the Arm Rest is not real leather you can obtain a superb Italian Leather cover that fits fully over the entire Arm Rest from here on EBay
https://www.ebay.co.uk/itm/FITS-ROVE...72.m2749.l2649
or just go onto EBay and do a search for 'ROVER MG ZR 75 ARMREST BLACK COVER LEATHER' . Cost is £24.99
These are now fitted on my 75’s and look / feel terrific.
Just a thought!