The presentation took place at TrustFord, Wilmslow, Cheshire.
Rory, 54, has multiple sclerosis and has leased cars with Motability since 1996. He can only walk a few paces and has little use of his left-hand-side, so he uses an electric wheelchair.
His Ford Kuga has been fitted with an electric hoist to store his wheelchair.
Rory said: ‘Motability has been a great support to me over the years, so I am very grateful to the scheme. My car provides me with a lifeline and without it I would be completely stuck indoors, especially as my wheelchair is so bulky.
‘Although I am unable drive any more, my carers can drive me wherever I need to be.’
Mr Osborne said: ‘It is a great pleasure to be here and present my constituent Rory with the keys to his new Motability car. I am also delighted to meet those who work for Motability and others associated with this fantastic scheme.’
Lord Sterling, chairman of Motability, said: ‘We are delighted that Mr Osborne could join us for this special presentation. We have supported more than three-and-a-half million disabled people and their families with their personal mobility since 1978 and look forward to assisting many more in the decades to come.’
John Leeman, operations director at TrustFord, added: ‘Motability is an extraordinary initiative and we are very proud of what we have been able to accomplish through the scheme.
‘Over the years our dedicated team of Motability specialists have provided thousands of customers with vehicles tailored around their individual requirements, such as Mr Moss.’