Penii is the culturally accepted plural for penis, although it might just be my culture, because how often are multiple penises referred to? No idea. Penii sounds more worldly. Like octopi or virii. *shrug*
In the interest of fairness, and in keeping with giving credit where credit is due, the files for these can be found for free online at https://www.thingiverse.com/thing:3930464 and https://www.thingiverse.com/thing:3693530 if you have your own printer and would like to print your own.