I eventually had them custom fitted one afternoon as I passed through Mansfield in 2012 , they measured up and installed them (gratis because they were taking the measurements for production) very quickly. They loaned me a car and had them ready for when I returned after a leisurely meal.
The blinds unclip and refit very easily for cleaning the insides of the windows. Very pleased with them
after almost two years now.
I haven't checked but I'd guess they have been generally available for this model since then.