Sounds like you've solved many part issues.
The front forks are similar to Suzuki GS125 forks. EMB modified the springs and steel -- used stronger steel and springs than the GS125 due to the Lectra's increased weight. Otherwise, the forks should be the same as a GS125, including the seals.
A couple points:
For your chain, make sure it is roller chain WITHOUT O-rings. The O-rings cause excessive drag and reduce power to the rear wheel by about 1/2 HP.
The front sprocket EMB purchased from Sprocket Specialists in So.Cal. They are very similar to Honda moto-cross front sprockets -- 420 chain size.
The rear sprockets were custom molded and machined. However the design started with go-kart sprockets EMB bought from Azusa Engineering in So. Cal.
Sorry about ZAP providing poor service -- but it's not the bankruptcy -- their service sucked for as long as I can remember..... I'm happy to help.