Well if it isnt a mid to late 50's car it doesn't have fins but... I have never been a fan of canards on anything that wasn't a GT car throwing sparks out the rear as it drags down the race track. For starters they really only server a purpose on an aerodynamically designed for them to actually create noticeable downforce which a brick (510) won't do. Two the liability from someone walking past and cutting themselves because they aren't watching where they are walking. Finally because when the damage they do to the surrounding area when they get ripped off from whatever which they will.
P.S. they look out of place on a 510 or any pre 90's japanese car Go with an air dam and a splitter. Looks better and is actually functional. This is of course my opinion and ultimately it is your car which means what you think is all that matters.
I take it back on the what you think part. It's a 4 door so I feel like putting performance looking things on it is like a guy putting a performance (loud coffee can) exhaust on his mazda 626..... Why?