L78 Oil Pressure switch reducers

[mbxlesney]

I need to know if these are available or if anyone else has had trouble finding them. I have attached a pic out of an assembly manual that shows these. They may be made of brass and connect the oil pressure switch without gauges to the 45 degree brass elbow on the block of L78 and possibly L72, LS6 without gauges. I have found ones simiular on plumbing type company web sites. Is this possibly the only alternative to finding these. The book shows one as a connector and the other as a spacer. The Parts and Illustrations manual refers to Group 8.9XX which is not
actually in the manual as I have found with most hardware shown in the Illustrations part. I guess the parts dept. at the dealerships only had access to Group 8.9XX or bins of hardware or had to order the hardware if you needed something. Any help in pointing me in the right direction to obtain these would be appreciated. I have not seen these available in the aftermarket, Used or NOS. Thanks Kim