Need help with PGT lock

The lock broke on our PGT sliding glass door. Looking at your website, and video (very helpful by the way) I believe I need the 82-218 round face lock. However, I am concerned that the part that includes the knob that you turn to lock the door may need to be replaced as well (but maybe not). Thought I should order that part just in case, but don't know what it is. Also, is there a video about how to replace that part (the one with the knob)?

Finally, can you tell from the picture if the lock is a square face (82-223) or round face (82-218)?

See pictures of the Lock (82-218??) and the other part I am asking about- any suggestions.

Thanks very much,

Roger C

Thank you very much for your valuable advice. I ordered both of the ones you mentioned - the 82-229 lock with the template and the 82-218 lock without the template. After looking at them both it seemed easier to use the 82-229 and I was able to replace the lock a few minutes ago in 15 minutes (and I was going very slow and carefully). I am so very pleased.