Waz, happy to help if I can. What conversion kit are you wanting to install.
Bear your right things can get pretty expensive, if you don't spend wisely. Have you gotten to go on any of the gasoline alleys rides yet. I have been away every weekend they have had the rides. Maybe next time.
How is the 48 it was a tough choice between the iron and the 48, they both look wonderful.
Yep the kits just bolt on. See the pic below (best pic I have at this point). Seat kit comes assembled (seat and mount kit) two bolts B (existing seat bolt) and C (through the frame by existig hole) are the only ones needed to be put on.
C is still a bitch to tighten. I found the best trick is to screw nut down until a small amount of bolt sticks through the top. Multigrip the top and screw the nut right downhill it tightens up good.
I don't about the 2010 version but when I rip the sat off to 2012 model this is what I see:
www.ebay.com/itm/2010-2012-Blk-Gator-Spring-Seat-Conversion-Kit-Sportster-Harley-Nightster-48-cs-/290605190261
Check the images
Waz, glad to hear it went well, love to see a picture of it as well as that bitwell seat.