Oklahoma Joe's Longhorn Smoker grommets, grommets for temp probes. The metal on these smokers is 2.5mm thick on the side of the cooking chamber. After way too much research and finding a lot of overpriced junk, here is the link to ones that will fit perfect. https://www.amazon.com/Ocasar-Gromm...dp/B0B8TTHNSY/ref=psdc_16409801_t3_B08T1DPCCS