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

Fleck Spacer - 11451

Fleck Spacer

Fleck Injector Body, 1600 - 17776

Fleck Injector Body, 1600

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Parts & Accessories
3200 Timer Assembly, 12-DAY
$164.00
Complete 3200 timer for 2510/2750/2850 series valves using 120v mechanical meter configurations. The program wheel conforms to 12-day timeclock-based regeneration configurations.
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Availability: Out of Stock
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Parts & Accessories
Seal - 13242
$4.25
Seal
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Availability: Out of Stock
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Parts & Accessories
Seal & Spacer Kit, 7000 Series - 61438
$33.00
Use this seal & spacer kit for all 7000SE and 7000SXT valves in STANDARD or FILTER configuration. Kit consists of (4) spacers, and (5) seals.
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Availability: Out of Stock