much more manageable to just buy what you need so the proper lens shade will still fit but…

Step Up Ring Adapter 46mm to 77mm Step-Up Lens Adapter Ring for Filters UV,ND,CPL Camera Filters, Compatible with All 46mm Camera Lenses & 77mm Accessories ($14)

https://www.amazon.com/Adapter-Step-Up-Filters-Compatible-Accessories/dp/B07WK2TNDT/ref=sr\_1\_6?crid=1Z9Y58QV8QHPN&keywords=camera+step+down+ring+46%2C%2C+77mm&qid=1649210342&sprefix=camera+step+down+ring+46%2C%2C+77mm%2Caps%2C133&sr=8-6

Tiffen 46ND9 46mm Neutral Density 0.9 3-Stop Filter ($19)

https://www.amazon.com/Tiffen-46ND9-Neutral-Density-3-Stop/dp/B000BTYEHA/ref=sr\_1\_8?crid=18IBBF1CNY2O3&keywords=camera+ND+Filter+46mm&qid=1649210578&sprefix=camera+nd+filter+46mm%2Caps%2C128&sr=8-8

why exactly are you using something like this on a modern digital camera? Easier to just adjust your ISO or leave it on auto adjust…

Step up rings are for when the ND filter is too big... Step down rings are for when the filter thread of the lens is too big...

As for the ring size, I found this one on amazon for $13... might be worth something...

https://www.amazon.com/Adapter-Step-Up-Filters-Compatible-Accessories/dp/B07WK2TNDT/ref=sr\_1\_1\_sspa?crid=255T3TZOFQVC5&keywords=46mm%2Bto%2B77mm%2Bstep%2Bup%2Bring&qid=1649127595&sprefix=46mm-77%2Caps%2C112&sr=8-1-spons&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFCTEY5SVY3NVRHRjQmZW5jcnlwdGVkSWQ9QTAyODE5NTIyNTROUUFGSjQ5SVg0JmVuY3J5cHRlZEFkSWQ9QTA4OTgyNTIxU0pMQkVLSlZJVlpCJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ&th=1