Where can I find an external stringer course/decorative wall moulding like this? All manner of questions and solutions to problems and issues surrounding the subject of brickwork, blockwork and stonework

[TorTriesDIY]

Hello! I have a terraced house with an ugly wraparound stringer course halfway up the facade. I've been looking for a Greek style exterior wall moulding in the UK like the one pictured but I can't seem to find any that are light, probably polyurethane?, and have at least 23cm in height and come in good lengths. I've Googled for ages but I fear my prompts aren't correct as I can't find anything suitable. Thanks for your help, if anyone can direct me to the product! (I"m talking about the white, patterned strip in the photo, in case I got the description wrong!)