Akro round can rebuild - BIC?

Trying to help a friend who has a round Akro with a damaged inlet end - the end that fits onto the link pipe.

These people do inlets.

http://www.pjengineering.co.uk/products.asp?cat=10

Does anyone know the required size?

If anyone has experience of a similar rebuid please share.

Thanks.

I think pj engineering only do the 110mm or smaller diameter caps but the akras are something around 115mm