Heater control coloured plastic

[Steve_D]

Behind the dash 'veneer' there are some coloured plastic 'filters' glued and aligned with the heater control symbol lights.
Has anyone found a suitable source for replacements.
I have two dashes to deal with at present. On one the filters are in very poor condition and on the other some of them are missing completely.

Thanks
Steve

[Steve_D]

Thanks for the reply.
The link was to filter gels which are probably too thin.
It did take me to some tinted perspex also on ebay which looks like it will do the job.

Steve