Try NAPA
602-1066 and 602-1067
I'm not sure that's exactly what you need but I think so, order a set and see.
If not they do have a few more choices for similar mounts.

Picture attached
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2430582810080251109OalsSg_fs.jpg (297.68 KB, 47 downloads)

Last edited by Grigg; 09/05/2017 12:42 PM. Reason: add pic.
•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-