this is a classic bike, congratulations on getting your hands on it.
you will not get its spare parts easily from the market, this is not cd 70. you will have to restore most of its original parts, and luckily you have got a lot of parts with your bike (as i can see in the pictures). you may try your luck at shershah (karachi) and bilal ganj (lahore). hopefully you will find some parts for this bike, or parts from other bikes that would fit this bike.
A cousin of mine restored this bike in 90s in karachi. he bought it from army auction for ~3000 rupees back then. it was a really powerful bike. he used to ride it on super highway (karachi/hyderabad) and did 120 mph (which is almost 200km/h) on it.
best of luck with the restoration process. and do post the pics and details as you go ahead with the restoration.