You will get indicator light and rear light covers from Bahu/babu Mohallla Rawalpindi, its 3rd last shop on the right side, the guy has good collection of older car lights and displayed them as well. Ask him for Unimog lights, it would be easier if you can take a sample with you (broken light). I can arrange a sample if you don't have one. Merc desi Emblum is easily available, for original, there's an old Merc kabaria located just before Gawalmandi on the right side of the road if you are approaching from Sadar sid.
Where are you located in Isloo? (PM me), I can pay a quick visit to help understanding the gearing ratios and combinations, they are also posted in detail by DD on this forum, would have to explore punga for that