There is a good chance that Bosun's Locker will have what you
are looking for but if they don't they can have it in a day
 or so as they seem to have an excellent transportation system
 in order to have items shipped from Izmir or Istanbul.

Their shop is located on the corner west of the second bridge near Netsel Marina.

Tel : 00 90 252 413 06 78 / 00 90 252 413 54 51
Fax : 00 90 252 413 56 02