If the answer to ngoma's question above is "yes" then the seal kit you need is Bosch DGK126. Should be on the shelf at any fuel injection rebuilder or easily found on ebay, so should not take you too much work to find. Make sure you get Bosch parts and not a cheap knock-off set, though. And you need the 17mm shaft seal which DGK126 should have. Watch out, as some other kits look similar but come with a 20mm shaft seal instead.
Replacing the rest of the seals is a finicky task though. It is a good idea to be sure you know exactly what you are planning to do before you take it apart, since you only get one chance to make the reference notes you will need in order to get it back together correctly where it will run the engine again.
Not rocket science by any stretch but set aside some time to do it carefully. And keep everything surgically clean -- you probably know that already.
The shaft seal by comparison takes some finesse but is no different in principle than doing any crank or camshaft seal. Still plenty of opportunity to have it go wrong, but the good part is it only goes together one way, unlike the rest of the pump.