I replaced both of mine on my 2011 +4 18 minths ago. After much agro searching and phone calls to various morgan approved dealers and MMC themselves i went to FDTS (susan tayor) 01932342043. All up bill was £150 which incuded new mechanisms and changing the webbing from black to red to match the upholstery leather and hotshot return postage.
I can't speak highly enough of the service i received from her biggest problem was getting her to send me a bill! I believe some of the MMC dealers use her.
I 'm not related and have no interest jn the company