L'Arsenal of France lists a set of assorted open, closed, and roller chocks/fairleads in 1:350 scale resin
Order L'Arsenal direct, from White Ensign Models in the UK , or from Pacific Front Hobbies or ShipCamouflage.com in the States.
White Ensign also makes a set of PE open and closed chocks & fairleads.
It is simple to scratchbuild some bollards. All it takes is some fine Evergreen rod (1/2 mm or thereabouts). Cement two pieces to a strip of plastic (base) standing vertically. Space them about the rod diameter apart. Trim to height