Help with Gravely 1975 walk behind tractor

Hi all,
new here, but hope some one can help. Will be buying this walk behind tractor, but there is a part missing, which I dont know what it is. I am based in Europe and the seller know nothing about the machine either. I am attaching pictures. It looks like two hose are missing but from where to where and what do they do, I do not know. The machine is working perfectly fine without them, there is no compressioon both pipes when press with finger tips. Also, can this tractor be use to pull simple cultivator like this one:


This is the part with missing hoses:
click this text to view image
It is just under the air filter and exhaust

Don't know why image is not displayed, so had to do it with a link.

Basically I want to use it like that, but not sure if handles not to short, not allowing me to properly hold and operate when plow plug attached.