Since LulzBot 3D Printers are certified Open Source Hardware, modifications and upgrades are a lot more feasible. This part should fit nicely, it’s similar to the one used in the LulzBot TAZ MOARstruder: https://www.lulzbot.com/store/parts/lulzbot-long-block-hot-end-kit-12mm
You didn’t say much about what model your tool head is and how it got damaged, but wouldn’t it be easier to replace the damaged hotend with a stock Hexagon like this one, https://www.lulzbot.com/store/parts/lulzbot-v2-hexagon-hot-end?
As it says on that page, contact LulzBot support for assistance with your tool head. They should be able to suggest the easiest route for repair.