Unfortunately, Spring Over parts for the most part look generic. Here are a few tips for identifying their manufacturer:
If the perches have no tack welds onto the axle housing or look like they were purpose-designed to have no welds, Most likely it is from Rocky Road Outfitters.
If the Draglink is painted Safety Red/Orange It is possible that the draglink (if not the entire SPOA) is a Breeze Industries product. Several vendors -- Including North Coast Offroad - sell this fine product from Canada.
That's about as far as I can go with identifying specific manufacturers.
A true purpose-designed SPOA kit (eg the spring perches) is very easy to identify. If you inspect the spring perch on the front passenger side, you may notice that the inner curved edge of the perch has a larger diameter to accomodate the larger diameter of the axle case it sits on next to the differential housing. A purpose-designed sperch kit will have this feature while a cheap, slapped-together-with-trailer perches from a farm supply store will not.
Most SPOAs are actually a hybrid of various products (perches, draglinks, brake lines, driveshaft spacers, rear shock mounts, etc.). This gives the buyer (who, after all is thrifty - why else buy a Samurai!) the ability to tightly control his/her costs by obtaining many of the parts from a savage yard instead of as a complete kit.
Hopefully others will add to the limited identification that information I have provided.
Welcome to the offroad side of Samurais!