Driving with ankylosing spondylitis

I am 75 years old and been driving since I was 17.  I currently cover about 12 thousand miles a year but of late I am having increasing difficulty viewing traffic approaching from the right due to limited mobility of my neck.   Traffic islands with roads joining at 45% give me real problems and I have to twist from the torso to see.    I have no other problems when driving and was wondering if anyone else has similar difficulty and if so what have they done, if anything, to overcome this.    Years ago a hospital Physio suggested that when the time came I would be able to fit specially adapted mirrors but I have so far not been able to source these.    Look forward to any suggestions.