Fanboy Forge has 3 new tank tread options available over in their webshop for you to check out.
From the release:
For all those builders out there we are now offering Scrap Tread units. These are great for customizing existing models or building your own. Half-tracks, gun carriages, mini tanks, crawlers, the list is endless. Please note that these aren’t a regularly stocked item and made to order, so please allow a few extra days for manufacture. Yum, fresh!