endcaps for tank mod....

[craftmath]

Does anyone have any recommendations for endcaps to place on a homemade tank from polycarbonate tubing? The tank works great, but I'm looking for something to throw onto the end to cover the cuts I made on the tubing and to give the tank a nice, finished look. I have two J-Tanks and I like how the "grommets" have a part that serves as an endcap, and prevents you from inserting the seal too far. Also makes for easy removal. Anyone found these pieces? A simple stainless steel or aluminum cap would serve nicely too, but I can't find anything at Lowe's, nor at some places I've looked online.

[Rhals]

I love these: Specialty End Caps - Beveled, Airflow, Slants - Vaperfexion