So I’ve got the original Nothing Ear 1. SIlicone that came with it never fitted, they fell out all the time. I’d used Comply foam on other hphones so tried them on this. The correct model to use is T400. The issue is that they’re too long to fit in the case, so you’ll need to cut them shorter. Not ideal and even then if they are a bit near the edge of the case, over time they’ll wear down and start splitting. Nevertheless, the audio is substantially improved, and to an earlier point, the highs aren’t affected. It’s just a better seal and the full audio being delivered is getting to your ear instead of leaking out the side.
In the UK these are about £15 for a pair of 3 and in regular use, I’d say you’ll need to replace them once a month. So 3 x months for 15 quid.
I’m actually going to try the below, available on amazon. Just paste title in…
COMPLY Premium Memory Foam Earphones Tips For Airpods Pro Generation 1 & 2 Replacement Earbud Tips For A Comfortable Secure Fit x 3 Pairs (Medium)