Rear lower coil spring seat size?
 

As the title states. Does anyone know the size of the rear lower rubber coil spring seat? Or a part number for a polyurethane parts to replace the stock Honda part? Mine are pretty trashed and I would prefer to replace them with poly. Stock part number is 52748-SNA-A10. I have searched, but found nothing. If I can get thecsize I can probably get a unifersal poly part that will fit. TIA.