656 hydraulic pump O ring and suction problems

We have a couple 656's and both suffer from hyd suction issues. I found an early 560 screen type hyd filter for one tractor and that made a big difference. The modern paper filters restrict the fluid flow when its cold. Question: I need a part number ,or dimensions of the pump to casting O ring on the suction side. Not the filter O ring. Also Is there a strainer on the end of the tube that goes to the rear sump? Thanks guys.
 

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