Anywhere also can find the manual gearbox ... its what you require thats limiting your choices ...
2 type of manual gearboxes
1) Clutch Cable
2) Clutch Pump
Sources for the gearboxes
1) Japan
2) Singapore
3) Australia/New Zealand
4) Taiwan
5) Hongkong
6) Local
Accessories:
* Gear Lever
* Gear lever boot
* Gear shaft cables
* Gearbox mounting bracket
* Gearbox mounting
* Flywheel
* Clutch set
* Reverse sensor
* Gear shift cables bracket
Expect around the price range of RM1500 and upwards depending on local market and also the type of gearbox you want.
I hope the information helps ...