When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Years ago I got a spreadsheet from Roland Kusmaul (god of Porsche Germany). 911SLOW posted it. Try a search. If not email me and I will send you the setup I got back n the day. rrouleau@presud.com