Not an easy answer. For instance, what are we 'matching'?? Older cars with 'aged' silver paint? Recent production cars in new condition?
All that aside, though, I've never painted a silver 2400 series car. I have redone several 2500 series (aluminum) cars and found that Tamiya's Silver Leaf, TS-30, in the 100ml rattle-can is my favorite match for painting the silver vestibules, dome, truck side frames (if appropriate) for those cars. Plus, the Tamiya rattle-can has a superior spray head, spray pattern/quality among the common rattle-can hobby paints. But, that's just my humble opinion.
I'm sure others will have an alternate choice....
KD