Numerous places aliexpress is where i got mine from if you are prepared to wait for them to be shipped, though you can now get them from eBay or Amazon at inflated prices ....
www.aliexpress.com/w/wholesale-a5-dynamic-turn-signal.html
mine came from this shop
www.autoaux.aliexpress.com/store/607693?spm=a2g0o.detail.1000061.1.d3087d9eA5AiAx
www.aliexpress.com/w/wholesale-a5-dynamic-turn-signal.html
mine came from this shop
www.autoaux.aliexpress.com/store/607693?spm=a2g0o.detail.1000061.1.d3087d9eA5AiAx