Simplify the refurbishment of the master cylinder, with new, correct specification parts that, when fitted correctly, will bring the brakes back to showroom fresh effectiveness!
For other master cylinder components that may need renewing, check the schematic for your model, and see all the parts clearly with the 'Big Image' facility, where they fit and, importantly, the correct part numbers!
Other parts you may wish to consider:
TIP: Fill the reservoir with brake fluid and leave for a few hours before bleeding. You will be surprised what gravity can achieve! Make sure you order all the parts you require at the same time and save money by avoiding multiple shipping charges.