When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I don't know where you can buy a bolt on part, but if you still have the stock coolant pipe, you could cut the flange off that pipe, and weld a suitable -6AN bung to it.
In that case you could weld a bung to the LIM directly. Riskier if you lack the AL welding skills, and would require you to pull the LIM off the engine to do it, but certainly do-able.