Best thing to do is get the 1971 Buick Chassis and assembly manuals. https://m.ebay.com/itm/1971-BUICK-S...%3A9f51582c15e0abc01ee6c357ffe6d07a%7Ciid%3A8 https://m.ebay.com/itm/1971-Buick-F...%3A9f53b30815e0a8670d6c62fcfff325eb%7Ciid%3A1
I have an all original 71 sitting in my shop right now that I am just in the beginnings of restoring. In search of a gas tank! GOOD LUCK!!! anyway what pictures do you need? Mine is unmolested.