I have seen them from 300 to a grand. Some guys make special ones. Hi tech performance has one for 500 polished 300 un-polished. Not sure how it works, looks good. I think HBJet got his from Tom Papp you could e-mail him and ask him. Jack at MPD sells nice ones but they are expensive like a grand or so. Yeah they hold up better then the regular motor mounts. What is nice is with 4 bolts and if you have a one wire alternator and a piece to your starter to disconnect in one spot you pretty much can have the motor out. As far as installing the rail kit its not that hard you just need a cherry picker and put the motor in line everything up to where it should be let the motor hang, mark your holes take the motor out. drill and mount rail kit and set the motor back in.