i've seen a video where a guy installed 4 on each side
talking to the owner of cincinnati sailing he said two a side should be all i need

where do the two go?
attached is a picture of the casting please let me know:
https://drive.google.com/open?id=0B6tZrLZEdOnESjBZd2lhRFczNU0

[img]https://drive.google.com/open?id=0B6tZrLZEdOnESjBZd2lhRFczNU0[/img]