T25 and T4 upper spring packing for the top of the spring.
If you got a T4, these were used on the 16inhc wheel busses.
This one is shaped to support the rear coils of the spring.
Exclusive BUS-ok Production, that means high quality
as the genuine part.
This is not a f*ing part from an 3D-Printer.
OEM part number 251-511-149