Hello I will help you with your question,

The "best" way to remove the retaining ring and cap are with the special tool shown in the procedure below

Click here for procedure

There are some aftermarket tools available that will do the same job but having the right tool is the way to do this job without damaging the ring or the seal. The procedure shows what needs to be replaced along with the pump.

Some autoparts stores may have a generic tool in their tool loaner program that can be made to work. Having the even pressure to arms of the tool shown provide is the key to turning the ring without damage though.

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Yes the retainer will break and you need to install a new one along with new packing.

Do you have the new pump?

You may be able to turn the retainer so the tabs line up with the slots and you can pull it out.

The retainer is a 42693 ($20) and the packing is a 42185 ($25)

Let me know what I can do to help

If you would like any additional information or have more questions please don't hesitate to ask!

Please remember to only rate my service not the content as you may not like the answer but it is the truth. Only rate when you are satisfied. IF you feel the need to click the lower two ratings they are negative feedback that sticks on my record so please stop and reply to me via the REPLY TO EXPERT button with the issue you have. I will be happy to continue further and do everything I can to provide you with the service you seek.

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Yes these are dealer parts.

The link below is one online source for Mazda parts, there are many others. The packing is a gasket that supports the pump against the cap. It is shown in the assembly procedure

Click here for link

Please let me know what I can do to help

If you would like any additional information or have more questions please don't hesitate to ask!

Please remember to only rate my service not the content as you may not like the answer but it is the truth. Only rate when you are satisfied. IF you feel the need to click the lower two ratings they are negative feedback that sticks on my record so please stop and reply to me via the REPLY TO EXPERT button with the issue you have. I will be happy to continue further and do everything I can to provide you with the service you seek.

Thank you