What size inspection chamber cover?

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I've had an open inspection chamber for a while now and figured it was time I got round to removing the paving slab 'lid' and actually buying a cover but I can't for the life of me work out what size I need.

Online they seem to come as standard at 450 or 300 but the end of the chambier riser is 310 internally and around 355 externally.

I've attached some pictures of the measurements, any help would be appreciated!
 

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Andy
 
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Yeah it's a riser. That cover you linked is 450mm so won't fit?
Have a scroll down a bit further, gives frequently bought together, and the riser is 450mm?
 
Have a scroll down a bit further, gives frequently bought together, and the riser is 450mm?
The 320mm one could do the job, but it doesn't say where the 320mm is measured. I'd prefer to buy one local on the basis of return if it doesn't fit.
 
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