...I'm still not sure about the smog tubes, ... A/C vs. non-A/C, ...however at least I'm glad to see the tubes from my car (L30 w/AC) and Dan's car (L48 w/AC) do appear to match up. I'll continue to follow up on this, but thought I'd post these pics so far.
Here is a photo of the smog tubes from my '67:
Note: Top is the PASS side tube, ...bottom is the DRIVER side (and yes they have had 'attempted' repairs of years ago, ...that brazing looks like bubble gum...)
Here are two separate photos from Dan: