I just searched for 22” blackstone regulator. I got a 6.5 foot low pressure regulator made for blackstone and it works perfect. 25$ and fired mine right up

https://www.amazon.com/Iococee-Regulator-Universal-Replacement-Blackstone/dp/B08SCCNSHB/ref=mp_s_a_1_3?crid=1BBYNG6RCWDQQ&keywords=6.5+ft+regulator+blackstone&qid=1672282868&sprefix=6.5+ft+regulator+blackstone%2Caps%2C92&sr=8-3