Hey guys, I have recently picked up a 1980 GMC Sierra Grande 1500 and the interior is in not so great condition. I am planning on redoing the whole interior but I am having problems trying to find what parts from what years will work. Does anyone know the difference between year to year for these truck for all of the interior? I am really having a hard time trying to find the info. I have located a nice bench from a 86 will that work? I am also missing the HVAC ducting (no AC) what years can I grab some from? Also I am looking for a instrument gauge cluster will the 79/80 one only work? Thanks in advance!