Our walk in shower (20 years old) has developed a leak around the shower trim. I have taken it off and temporarily sealed the base with silicon gel. I am looking for a replacement shower trim but while there are plenty available I do not see any of the shape I want. The shape is approximately Y shaped with small ridges on the base of the Y to clamp in to the fitting behind the tiles. Does anyone know where I can buy shower trim like this? Thank you