I just got done putting propane on a 20r and was able to use the stock 20r base plate and all the propane stuff bolted right up. I will take a couple pictures and i am going to alter the adapter bc my template was based off a 22r carb. If there is any interest I am going to make a couple adapters to fit both 20r and 22r carb base plates because it was pretty much impossible to find the adapter and never did find one for the 20r. If anyone is interested i would like to have a count before i start. Cost will be reasonable