When installing the injectors, you get two metal "backup" washers and two larger o-rings as well. The washers go in first, then the o-rings, then the injectors, make sure you align the stud on the injectors with the slot in the housing, it'll then pop back in. Fuel pump regulator wasn't too bad, main problem was keeping the diaphragm flat while pushing the housing down. You also get two new nylon washers for the fuel fittings.
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