Slick harness o-ring?

[RV7A Flyer]

Mags are at 500 hours, so off they came today to go in to the shop for 500-hour inspection on Monday. While reading through the Slick manual, I came across this:

3.4.5
O-RING
Inspect harness cap O-ring for wear and replace as necessary.

Hmmm, says I...my mags didn't come with any such thing. Nothing in the cap, nothing on the mag body. Slick 4370 and 4371 mags, direct from Lycoming on the YIO-360-M1B.

Are they missing something? Or does this model not use any o-ring under the harness cap?

ETA: Never mind...I think I see it now. 6300 series use an o-ring for pressurized mags. Doh!

[Red Mtn flyer]

- when i turn the page and find the answer.
Even more so when i re-remember i learned that tidbit years ago...