try here first to see if they can get you the parts.
If not,
Try
http://www.erebunicorp.com
http://www.nrauto.com
or perhaps
http://www.bekkers.com might have kits.
erebuni and nrauto definately have them in replicas, including some other nice looking kits.
I believe nrauto has a replica lorinser kit too for the 124 chassis cars.
Either way you are looking at spending at least a grand if not more for the parts.
Alon