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If the tops are already cut, then the modified Bosch fuel injector will sit higher than the stock fuel injectors.
This is why a "custom" lower grommet is used to take up the extra space now there.
With the Bosch modified with the tops cut, the fuel rail opening will sink all the way to the newly cut top.
The stock fuel injectors use that stupid "insulation" grommet that just gets compressed and warped in that area.
We typically use the "triple o-ring" trick at the top to seal the fuel rail on the top.
I keep a short length of 10mm I.D. silicone hose or 3/8" fuel hose to cut to length just to seal off the bottoms to the engine.
The newly modified Bosch fuel injectors will sit about 1/8" higher, which means that any stock type lower (sealing) grommet will not work - i.e. not seal correctly.
-Ted
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