pony boy 68

i need glass for my 68 convertible LH door.my RH door has the rounded back corner which someone told me was fastback glass. so i assume i have the wrong glass in my RH door. on ebay i see two types of glass for sale. one has the straight back corner with a 90 degree angle and another has straight back corner with a less than 90 degree angle. if someone out there with a 68 convertible could check their glass and tell me which i need i would greatly appreciate it. even if you have a 67 convertible would probably help also. thankyou very much. have a nice one