Flush cone for old toilet?

[ug61dec]

Hi all,

Could someone please tell me what sort of flush cone I need for this toilet? A picture of the spigot is hopefully here:

https://photos.app.goo.gl/tGmg99yQhwz8TDFWA

I've tried the only external flush cone I can find, but it's both too long and too wide. The ceramic lip on the top of the spigot prevents the cone or the pipe going in what I'd consider to be the 'normal' amount
https://www.screwfix.com/p/euroflo-flush-pipe-connector-1/6246r

I assume one of the older types of cones with fins on would do, but can seem to find them anywhere.
Standard 40mm flushpipe going into it.

Thanks

 

[denso13]

This https://www.toolstation.com/flush-pipe-connector/p28142?