You won't find anything for US nukes in 1/72, unless it was glommed out of an old kit. Whatcha makin'? There a no bollards on US submarines. Bollards to us are something that stick up out of a pier. You got retractable cleats and fixed cleats. Most folks get the cleat cover plate shapes wrong for the retracted ones. The fixed ones are pretty easy. Hull zincs are best made from styrene strip. The traditional cast white metal ones that come with kits are grossly out of scale. The styrene strip is even better for weathering, too. As zincs are consumed they turn into zinc oxide, white in color. You place your strips, paint the hull, a little creative scratching here and there, and bang! Realistically weathered zincs!!!!
You need some help, or additional info, just holler (pm, e-mail, etc.), we'll get you fixed up!
Bill & the Ol' 4rts!!!
"If you ignore the problem long enough, it will go away. Even flooding stops eventually!"