ST4 rear left indicator

I bought recently a 1999 ST4 and need to replace the rear left indicator. If anyone has a spare one or could provide guidance where best to buy one, would be much appreciated! Thanks and let’s hope the “Beast from the East” turns back to Siberia soon! My mobile is 07971 190 446.

I have several indicators, rear light stop light and other electrical bits including a headlight
available. From ST2.