If you can't find a seal kit for it there may be an industrial seal outlet in your area such as Seal Source as long as the gears haven't eaten in to the housing you should be able to rebuild it better than new. First inspect the housing look real close at the suction side as the bearings or bushings in the end caps wear the gear set will be pushed to the low pressure side of the housing causing wear. The wear on the end caps can usually be fixed buy lapping them a good hydraulics shop can do this for you it is a bit overkill but you may also ask them to Parkerize them after lapping. Then replace the bearings in the end caps. If the gear set is keyed to the shaft you can have them lap the ends of each gear also but only if you can remove them from the shaft. If you lap the gear set be sure that they are equal size within .001 of an inch and they may need to lap an end off the housing the same that was taken from the gears so upon assembly you have .003 to .005 clearance between the end caps and the gears be sure that the gear set rotates freely after you reassemble it
There are a lot of hydraulic shops out there that wish to just sell new parts but there are also ones that know how to make anything come back to life. If it is unfixable bring the manifold that it bolts to and they should be able to build an adaptor to except another pump.
