83 to 86 mitsu mighty max in the states is the same single square grille - they are usually on ebay from the phillipines from like atom boys although the quality isn't very good. Most any seats can fit - its what amount of work you want to do - try mitsu eclispes, starions, or other mitsu cars, not sure what you have there. There should be some items available from Japan for lowering, or chassis suspension / aim industries in the states.