I can confirm that the lens covers for the goggles 2 fit the goggles 3 perfectly. Got mine from.....
https://cloudcitydrones.com/products/dji-goggles-2-lens-protector?syclid=e37fb612-8ffd-4c64-902e-e2e533f9eb77&utm_campaign=shipment-out-for-delivery-email&utm_content=product&utm_medium=email&utm_source=OrderlyEmails

Hi, Funn 1. Thank you for reaching out. The official DJI Lens Cover of Goggles 2 is not interchangeable with Goggles 3 due to different sizes. We highly suggest purchasing any DJI products directly from our authorized online dealers listed below. Thank you for your kind understanding.

DJI Gamora Posted at 4-17 22:21
Hi, Funn 1. Thank you for reaching out. The official DJI Lens Cover of Goggles 2 is not interchangeable with Goggles 3 due to different sizes. We highly suggest purchasing any DJI products directly from our authorized online dealers listed below. Thank you for your kind understanding.
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--can be ignored--
I found the reseller
________________
Hello Gamora,

There are official reseller in germany?

Thank you

Really.....They fit mine!

Alex s.o.b. Posted at 4-17 22:30
--can be ignored--
I found the reseller
________________

Hi there. Glad that you have found a reseller. Please check here as well if the seller you have found is an authorized one: (https://www.dji.com/ca/where-to-buy/retail-stores). Hope this helps.

JMHO,  DJI should have provided a lens shield.  Save money by not having easy acro feature. Instead for couple dollars, euros, .... added a lens cover.  Just ordered an cheapo soft one from AMZ.  The above linked shield looks nice and functional.  Will consider if the cheapo AMZ seller version is junk.  Right now the chunk of foam that DJI uses to protect the lens during shipping will have to do.  Not very elegant.  Another reason why DJI should have included a lens protector.  They needed that piece of foam for protection during shipping.  Why not just provide a quality lens protector.

OldGuy2024 Posted at 4-19 08:55
JMHO,  DJI should have provided a lens shield.  Save money by not having easy acro feature. Instead for couple dollars, euros, .... added a lens cover.  Just ordered an cheapo soft one from AMZ.  The above linked shield looks nice and functional.  Will consider if the cheapo AMZ seller version is junk.  Right now the chunk of foam that DJI uses to protect the lens during shipping will have to do.  Not very elegant.  Another reason why DJI should have included a lens protector.  They needed that piece of foam for protection during shipping.  Why not just provide a quality lens protector.

Hi there. We appreciate your feedback. We will forward this suggestion of yours to the relevant team for attention. Rest assured, we're committed to providing the best experience for our users. Thank you for understanding.