Sorry for the later post.
We got the Blue Ox base plate installed on my 2008 Passion Cabriolet at Camping World for their special price of anything installed for $39.00 We found a used Blue Ox Aventa tow bar on Craigs List for an excellent price, lady had only used it 4 times. Beautiful condition.
eTrailer lists the parts needed if you do a quick search on their site and gives good pricing for reference or you can order the parts yourself and have someone do the install.
Chris in Virginia
2006 Sunseeker 3100SS/LTD
2008 Smart Passion Cabriolet TOAD
1986 Honda Helix (Original owner)