My Gillig Parts Manual has the below parts schematic for the Neway 125-6.
I cannot identify your part in question based upon the pictures.
I did have the rear bushings replaced on my rig about 4 years ago. Cost was about $1,000.
The mechanic at OMC in Eugene, Or. said it was not an emergency repair so I drove it that summer then had the repair done.
I also found a torn part lying in my driveway and made inquiries from there.
Hope the above pictures help. You will need to enlarge them.