I had been wondering the same thing. I bought turn signal mirrors with a red signal from muth signal mirrors (they have a website, too) for my Mustang but they don't have them for the Eldorado. However, they do have these little LED blinkers that you glue onto the mirror glass or attach to the housing. Since they go on top of existing mirror I guess one size fits all, just not quite so spectacular as the DTS turn signal mirrors.