I had need to partially replace the toerail capping on our R32 2 winters back and used teak obtained from a woodyard near Alexandria, who carries huge stocks and also of other useful timbers like Purple heart, greenheart etc.
I bought in boards of about 150x30mm and cut and shaped the right dimensions out of that. It has now weathered well to look similar to the >20 year old teak that wasn't damaged and wasn't replaced.
Co name Gilmour & Aitken. Very helpful.