Thank you so much Zip!
It appears to me that the interior colours are light slate grey and dark slate grey, but I could be wrong and it is, as you say, medium & dark slate grey.
A paint and a dye is to me vastly different, but will obviously accept that you done the right thing in this respect. It is small white marks on the door cards that made me want to obtain some form of touch-up, otherwise the interior is good. However, again it may be what I have got used to and needs renovation.
The seats, are they leather or plastic? As know it is the driver's seat that suffers the most. Would the same paint be ideal for this job?

I assume that you didn't use Mopar as Leather works are cheaper?
Though I have heard of Mequiars, Leather Works and Expel are unknown to me.
Are their products available in the UK?
One lens is very bad, perhaps because I unavoidably hit a deer on the motorway, which also broke the rubber strap attachment behind the headlight unit - hence the reason to obtain a new unit. However the ones I sourced are expensive. Any ideas?
I have endeavoured to clean the lenses though failed to get them completely clear, particularly the damaged one though will try again. Your advice however, is greatly appreciated!

Any further tips that will be of help to maintain the car, which I believe will be a valuable classic eventually, will be most welcomed.

Peter