The bolt on SF connectors that are offered by CE can you weld them in also? Correct me if I am wrong, the weld in ones that they offer require floor pan modifications, but all the previous posts that I have read about the bolt in ones do not require floor pan mod's. Someone please set me straight on this as I am in a bad need for them.. And is it absolutely necessary for the car to be sitting on all four when installing these, I don't have access to a lift. Any help would be most appreciated thanks in advance... I already have purchased solid body mount bushings, from CE is that really needed, not a track car just a weekend cruiser. Thanks again.