I have asked Alfaholics, about a year ago they said they could supply, then when I asked 2 months ago they said their supplier said not any more. I think there is a local guy here in Adelaide that I will ask next about the door cards. I already asked him about replicating the pattern a few years ago on the seats and he said he could not do it, I think he said he could do the door cards.
I still have an original set of leather door cards and seats for a 1750 S1 and I have made measurements between the stitching runs on the door cards. The distance is uneven, so these were made like this for a reason/s ? So you will have to work out what you want, how to instruct the person remaking them and what will appear authentic-like. As for the seat covers, I have been wondering about this for years, you would certainly need to pull apart an existing leather trimmed seat/s and take measurements make allowances for the leather shrinking. Since I am working on installing leather seats on my 1967 GT Veloce like the one as shown in Alfaholics web site of a white GTVeloce with red seats, I have not the need to pull apart my seats.
I have only seen dark brown and burgundy coloured seats in leather trim.
My next option is to get the pattern and see if the local leather supply shop which uses laser cut method if they will do it.