I source my rattle cans from my local bodyshop guy. He is currently respraying my TF, cant wait to get it back, its looking sooo good - anyway, he gets the paint mixed for me and supplied in spray cans for about 12 quid a can. As long as you know the colour code and sometimes the varient - some codes can have several different versions or tones, especially metallics. For example x-power grey, or LEF has four varients, my old TF had the variety with a yellow additive to the colour. Your Solar red may be a bit more simple to match though. Find you local bodyshop and see if he can get the stuff made up. I currently have a couple more tins of Firefrost red on order and a can of lacquer, just for doing some touch up work under the bonnet. Already done the ABS tray, now got to do the battery shelf. May have to do my mirrors too, if the painter did not bother doing them!
Sundance
ABS TRay
Here is the paint he mixed for me for my old LEF grey TF.....NOTE THE YELLOWER ADDITIVE ON THE LABEL!