One of my original Rear Harley Air over Hydraulic Shock Absorbers blew its seal and was leaking.
Now FWIW, I don't even want to get into any discussion about the quality of the OEM Harley Rear Touring Air over Hydraulic Shock Absorbers.
So anyhow, the original equipment Touring Rear Shock Absorber on most Harleys are built by Showa.
Harley says these Shock Absorbers can not be rebuilt. They can only be replaced with a new Harley Shock Absorber @ ~$200.00 list price. Much less on-line of course but still well over $150.00. Hence just one reason for lots of aftermarket alternatives.
However, Honda used this exact same Showa Shock Absorber on their GL1100 Goldwings.
You can buy this seal. Honda makes the Seal for these Shock Absorbers available. It's Honda P/N: 9157-463-013 and they can be found on-line for ~$15.00 each.
One set of Snap Ring Pliers and 12 ounces of 5 Weight Shock Absorber Oil (per shock) and you're good to go.
Do a YouTube search for Honda GL1100 Shock Rebuild and just follow along.
This was so easy even a Caveman can do it.
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These are the Shock Absorbers. 12" or 13" it doesn't matter.


Honda Part Number: 91257-463-013

 

I was researching a new set for my buddies bike a moth ago, I ran into similar info that the shocks were previously used on Gold Wings. Good post, thanks for the info.

 

A lot of riders are perfectly happy with these shocks. I am not one of them. Good intel, though.

 

Outstanding...thanks for the info. I have a 2015 Road King, 2006 Road King Classic with these shocks. I love them. I bought a 2019 Road Special and I hate the BS shocks that were on them. Last summer I changed them to the same shocks on my other RKs and now I love my RK Special. Got a take off from a 2016 RK with all the tubing on ebay for $150. Sadly one shock is leaking. I'm going to buy this part and rebuild the shock. The after market shocks for this bike is crazy expensive. It's just a motorcycle and I don't understand the reason folks would pay a $800 for rear shocks. To much YouTube I guess and folks are easily persuaded that more money is better. I have street rods and the shocks didn't cost that much!

 

If you can't tell the difference than there is no reason for better shocks. But many of us can tell the difference. And yeah it's "Just a motorcycle", but, that means that it only has 2 contact points on the pavement. The shocks make sure you have 2 contact points, not just 1.