Im Nihal using a 504 GL for last 18 years.Diesel 31 sri one.It is not having very best interior or exterior but very econamical vehicle having 1c diesel engine. If u wanna buy a 504 uve to look abt the interior condition. I fixed a 504 GR dash board & Nissan FB15 steering.
U can learn more abt 504 from following web site.
www.504.org