Which good colleges in can get for mechanical with air58000 in Jee mains 2019 general category

You will not get any NIT or IIIT with this rank but if you want good branch then go for some reputed private colleges like LNMIIT,Jaipur and NIRMA university , lovely professional University and Thapar University etc. They offer fantastic campus life and placements scenerios are also good there and comparable to many NITs and IIITs.
If you belong to Delhi region then apply for DTU, NSIT , IIIT delhi through JAC counselling seperately.

Best of luck