Summary

The side panel lock for the interceptor 650 is expensive, as you have to buy the entire set. This blank allows you to substitute a simple letterbox lock instead, eg https://www.amazon.co.uk/dp/B0BGLQSQZK?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

This should be printed with 100% fill.
Be careful about orientating the model, it won't need supports.
It's not high security, but it's better then the thuumb turns that some people have been resorting to.

Print Settings

Printer Brand:

Creality

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Ender-5 Plus</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>100%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Make sure you put the correct side down on the printer, they are orientated in the file as they fit together, not as they should print.<br>You may need to scale it slightly depending on your printer, that's going to be a try it and see.<br>The small bent tab fits perfectly from the lock in the link I included.</p></div>

Enfield Interceptor 650 side Panel lock adapter