There is a repair kit for these pumps. Bosch part number DGK301 The kit covers FP?K KE and KS pumps includes more parts than you'll need to rebuild your pump includes springs, copper crush washers, piston seal and check valves. Also included in the kit is the mounting gasket. There is a sediment bowl and prefilter cartridge included in the kit for other applications. Some of these pumps are used in heavy equipment and in the aviation industry. I got my kit overnight from a diesel injection shop I used in the past. Hope this makes the parts easier to track down. Price wise I got it for under $22.00 including shipping and local sales tax.

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82 300sd 198,000 miles
81 Harley FL 130,000 miles