I need to barrow a 67 up console tach mounting base

I believe there are two slightly different mounts, one for 68 and earlier and one for 69 and up. Reason I suspect this is because of the different top plates on the console itself. 68 and earlier have a machined groove running the length of the console. The pedestal, mount or adapter whatever its called has two small nubs on the bottom. I believe these sit in the recessed groove. The 69 and up console has a flat surface and doesn't require the "nubs". Will try and post pictures later today.