菲律宾采购需求：排水沟、缝隙排水沟、槽式排水沟、排水系统、排水盖、缝隙排水系统

I'm looking for precast concrete U-ditch drainage solutions with a strength of 25 MPa. The overall dimensions should be a height of 0.50 m and a width of 0.60 m, featuring wall thickness and bottom slab thickness both at 0.10 m. The length can be 1 m or whatever is available, but the inside opening width needs to be 0.40 m, compatible with the overall width after accounting for the walls. Please provide your best available options, including pricing and lead times.