INV 7HG MKIII perhaps?
https://mymic.rycote.com/products/shock-mounts-suspension/invision-broadcast-film/
Yep; that's it.
Ycoop, Rycotes work perfectly with SRS mounts and they are what I use as well. Yours with the Duo-Lyre 68 will work fine for a pair of heavier pencil mics, but I wonder if it might be a bit too stiff for your Avantones. My CM3s are much lighter than most mics, and I use the individual 72-shore Lyres and the SRS Mounting Base, both of which Darby linked in his post.
SRS tends to use the mount you have in all of their product photos, but it is NOT the correct choice in many applications. It is VERY stiff, and is designed for a shotgun mic with a large windscreen.
I recommend setting up your mics with the SRS mount in your INV-7 HG, and tapping the legs of your stand while listening through headphones to see how much vibration is transferred to your mics. If you feel that too much is coming through, you need less stiffness / more compliance and should buy a pair of the individual 72-shore Lyres.
Adorama has them in stock so you wouldn't have to wait for a special order from B&H. You don't need the SRS mounting base, as you would simply replace the Duo-Lyre on your INV-7 HG with these Lyres. You will need a very small Torx wrench (I don't remember the exact size).
Here is a thread where I go through the stiffness / compliance of all the Rycote Lyres. It is not intuitive.