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Need discontinued solenoid/hydraulic motor control valve for '99 SC400


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My mechanic informs me that the hydraulic motor control valve/solenoid for the hydraulic motor vane pump assembly on my '99 SC400 has failed.  The solenoid and the pump itself have been discontinued and are not available anywhere we've searched.  I contacted Lexus dealers and Lexus corporate and they were of no help.  We contacted wrecking yards and searched wrecking yards online, and nobody is familiar with these parts. They aren't even listed in the yards' online parts lists. Nothing on EBay.

The mechanic states that the car is basically useless without this system to cool the engine.  This is a beautiful car with only 73,000 original miles!  I would hate to lose it for want of this part.  Any and all suggestions are very welcome.  Thank you.

Part 16929-50050 solenoid.jpg

solenoid close up.jpg

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