Where can I find street sign connectors/adapters for poles that are 1 7/8" in diameter?

[WhatsYourSign?]

I'm looking for connectors that are 1 7/8" in diameter that mount on top of the poles that I can then connect street signs to.

It looks something like what you see in the image below:

Thanks in advance for any help!

 

[Pixels Are Bad Mmmkay?]

Grimco has them, although it says they are compatible with 2 3/8" posts...

https://www.grimco.com/Catalog/Products/PipePostHeavyDutyStreetSignBracket

 

[WhatsYourSign?]

Grimco has them, although it says they are compatible with 2 3/8" posts...

https://www.grimco.com/Catalog/Products/PipePostHeavyDutyStreetSignBracket

2 3/8" is the standard these days but some of these posts are 75+ years old (old manufacturing facility) and I guess the standard pole size back then was different than it is today.

 

[Pixels Are Bad Mmmkay?]

2 3/8" is the standard these days but some of these posts are 75+ years old (old manufacturing facility) and I guess the standard pole size back then was different than it is today.

In that case, I'd say you could maybe go with a 2" square post cap. It should still work, you just may need to drill and tap new set screw locations that are closer to center or use longer set screws.

Another option might be to find some galvanized 2.25" OD pipe with a 1/8" wall, cut them to whatever length you need, slit them, and use them as adaptors between the posts and post brackets.

 

[equippaint]

Heres a pipe chart, might get lucky with 2 3/8 OD and 1 7/8 ID to make a sleeve like was said above. I think sch40 2" is 2 3/8 OD, not sure if that's too loose?
http://www.msisupply.com/pipes-technical