Pat, your plus 4 should have the old type chromed cabinet lock type, not the later land rover type. Very difficult to source so best bet is try and find a replacement spring using the passenger door spring as a pattern. ' best of luck!
1969 4/4 1995 plus 8 1996 Plus 4 4seater 2002 Aero S1 2013 M3W 2014 Plus 8
