I got 10 minutes to myself so I checked my stash, I have two extra rally light bars one has the part # 2984187, fits 70-71 B and J cars, the other one has no part number tag but is identical. Both have the plug in wiring harness with bulbs. I'll be able to do pictures tomorrow.
Shipping could be expensive as I'm in BC Canada, but it's not very heavy so you never know.
What would you think it's worth? kind of hard to put a price on as I've always sold rally dashes complete when I've had them in the past.
Is the light tube the white plastic piece inside the dash, what you're looking for? I think there's 3 of them? I think I may have one in a parts rally dash set up I have.
Cheers Ken