Your search for "Fleck 2510 Service Kits" revealed the following:

Microswitch - 16433

Microswitch

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Parts & Accessories
Fleck O-Ring, -220, Connector (2-Pack) - 40951
$4.50
Fleck O-Ring, -220, Connector (2-Pack)
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Availability: Out of Stock
Drive Housing Assy, 5600 - 14448-001

Drive Housing Assembly, 5600

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Parts & Accessories
Fleck 5600 Valve Body Assembly, Downflow - 61400-12
$115.00
Downflow Valve Body Assembly. Ships with 1.05" Pilot for 1.05" OD risers.
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Availability: Out of Stock
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Parts & Accessories
Drive Housing Assy, 5600SXT - 14448-100
$56.00
5600SXT Drive Housing Assembly
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Availability: Out of Stock