It will be hard to make that seat or pan look good on a 550. Unless you don't plan on using side covers.
Three modifications were made by a previous owner to mount the seat. These allowed the side covers to remain on the bike.
1. The seat side of the hinge was moved towards the center of the bike.
2. The seat portion of the latch was moved towards the center of the bike.
3. The U shaped chrome tubing that sits above the rear fender was bent downwards to allow the seat to sit down.
The mod that causes the most pain is the location of the seat hinge. The seat only opens to a 45 degree angle. I plan on extending the bike half of the hinge outward and moving seat hinge outward as well to allow the seat to open 90 degrees.
-MD