Hello,
I am unsure why this is advising this on your side as it does appear to be working fine on our website now and brings up all our replacement slats,
please find link below for you to view also and you can then use our filter toolbar on the page to filter the products accordingly for what you are requiring.
https://www.blindsbypost.co.uk/replacement-slats
If any problems do let us know,
Thank you
Best regards
Sophie