I've been looking at a few different chin spoiler/air dam/belly pans. The one from Suzuki
http://www.powersportsnetwork.com/enthusiasts/catalog_item_detail.asp?catalog=638&levelcode=125&product=40722&cattype=&ProductCategoryCode=
is $400. Feh. Targa has one http://www.targa-acc.com/main_powersearch_nf.html, for $140 isn't bad. What other options are there for the GS500? Has anyone fabricated one themselves?
parts411.com has them painted for 161.36 and unpainted for 128.50. just go to their site and search for 'gs500'.
Check out this website: http://www.whaccessories.com/GS500Accessories.htm
Besides having 3 choices of belly pans to choose from, there are other cool accessories I have not seen anywhere else!
Can't vouch for them personally though.