I am trying to replace my subframe and differential bushings.

I have bushings for the subframe already, but I need to know if I should order S14 or S13 bushings for the differential to hold it secure? I am thinking S14 since the rear bolts bolt to the subframe, but don't want to order the wrong ones. Where do the front bolts mount to exactly?
S13:
http://splparts.com/store/product-info.php?pid17.html
S14:
http://splparts.com/store/product-info.php?pid18.html
Also, is there any easy way to tell which differential you have? Mine is 6 bolt axles and it looks like this:

