Am new to the site. Only recently purchased a 2006 convertible (kids finally gone and now time to play). Have rusted rear support braces on 2006 v6 convertible. Research shows that the parts for 2006 are AR3Z76102B54B and AR3Z76102B55B and priced around $500 each. The 2010 model shows 2 additional part numbers (AR3Z76102B54A and AR3Z76102B55A) for cars produced after 8/09. Was there a huge production change at 8/09 in the rear support area that required a part change? (http://www.fastoemparts.com/parts/2...&component=&searchText=&startRow=41&maxRow=10) Why would the "A" part numbers not fit cars produced before 8/09? The price of the "A" parts are roughly half of the "B" parts. Have seen several instances of people replacing these by welding in frame extensions. Would much rather have a bolt in replacement part, but dropping a grand for the parts is steep.