I know CSU55 covered this indepth, however this is the factory correct way to convert a Tri-5 chevy from a Granny 4 door to a 2 gear slamming 2 door. Most people don't know but 2-door post cars ( sedans) share the roof and most of rear quarter with a 4-door version, which makes this a pretty straight forward conversion. I purchased this 4-door about 2 years with the intention of stuffing a 350/350 in it and sell it. I learned a tough lesson that nobody wants to pay anything, like near nothing for decent running driving mechanically sound 4-door '55. So after much research and lamenting over the amount of work it would take to do it I said FUCK IT!! I can do this!! So a little help from Squablo on some '55 2 door doors and two really rusty, read WISCONSIN rust, rear quarters and B-pillar. I got the parts last spring and I waiting until Christmas break to start. I may be an idiot but I know my limits so when it came to the fitting of panels I enlisted a close friend and metal master, Mark Hopkins and E-Street Hot Rods (303)-646-2262. We basically gutted the car and found out that it needed more than just a floor, inner and outer rockers were marginal, trunk pan had some issues, several floor braces needed replacemant so we ordered all new steel. We then braced the roof with some tubes and cut away the rockers, floor and trunk pan so it could go to the blasters. We did not want to burry and rusty metal so we wanted the area of surgery to be solid steel and clean. We also discoved that the rockers cannot be replaced until the front fenders were removed. That is why in most pictures you see it without the front fenders. To do this you need to start with rockers first and get the car square. Then we hung the 2-door doors and checked the alignment with the door top and front clip which told us where to cut in the rear quarters. Remember these '55 rear quarters were only good above the belt line and we had add lower front quarter patches and some inner structure. In the end we had a a factory correct 2-door '55 chevy that is want I really wanted. The down side is this alot of work, probably 80 feet of welding and grinding!! In retrospect I would done this with a better 4-door start. Mine was border line, but it was what I had. You can find really solid 4-doors out there cheap and that would be the best start for a project like this. Here are some pictures of the car with side trim and new wheels and tires. I did not use ANY BONDO, what you see is the metal work, so it is not perfect. I am shooting for that early '60 gas class car that is mostly stock street car that a guy would bolt on the pie crust slicks and run on the weekends. Cody at Hurst racing tires hooked me up with the perfect set of pie crust cheater slicks for the rear that fit perfectly. I ordered some enamel Chasmere blue in spray bomb to try and match the patina. I still need to do some more work on it , but it looks pretty good for now. I need to get my front seat upolstered and put the glass in the car. I have the max pictures allowed on this thread so look for them on the last page.I have until the HAMB drags to finish it, so I take a weeekend off now.