inj cup replacement

[631b]

just bought an '01 that needs inj cups.(diagnosed with the help of others past posts) doin' the job myself but not that familiar with newer powerstrokes. will replace cups, inj o-rings but anything else i should get before i start? by the way she's got 386,000 miles and still runs like a top(except for the fuel in coolant!) thank you in advance for any help and knowledge you may lend!