if its the glass clamp you are needing, you can get them on ebay, they're pretty cheap.
https://www.ebay.co.uk/itm/361072649114?hash=item54119b639a:g:wrAAAOSwajVUMbFK
https://www.ebay.co.uk/itm/221576161398?hash=item3396f7e876:g:464AAOSwF1dUMawn
There's links to both sides as I'm not sure which side you need.