I have two Snapper SPA360 and one SPA520 older floating deck walk behind mowers. I have been told they use the same blades, but dealers I call are giving me part numbers for low lift blades. I have had low lift blades on a Toro 117 GM with 52" deck and was not impressed by them. I had to go slower with them since they had less lift. I usually don't run into sandy lawns where I live. I also have several older floating deck Snapper 52" walk behinds. Is there one blade that would fit all of them?