Hi. I have searched but have yet to find a definitive answer. I have an 08 sierra 5.3 flex fuel. I need to upgrade from the stock 36lb injectors to some 60s. Every set that I find says that they are not flex compatible. From my understanding the flex injectors are taller and have different electrical connectors compared to standard injectors. What can I do to run standard injectors? Would I need non flex fuel rails as well as pigtails? Any additional parts? Is there anyone that has done this upgrade that can verify? Thanks in advance.