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I'd call EMP in NJ. They rework and spring to suit "non-rebuildable" OEM shocks.

Klaus Huenecke – Owner
Phone : 732-786-9777

Gleaned from their site:

ESA shocks
We can rebuild ALL BMW ESA shocks – even though your dealer says they are not rebuildable. We can also shorten OEM ESA shocks for a lower ride height and we can supply new springs (Hyperpro progressive springs) for the OEM ESA shocks.
New ESA shocks are available from us, as Hyperpro ESA Hybrid or Wilbers WESA shocks. If the servo drive in your ESA shock no longer functions properly, we are able to replacement the servo drive at $355.00 each with installation included. We able to test all ESA servo drive functions and always test all of our customer’s ESA systems when the shocks are sent in for a service or transfer of the ESA components into a new Hyperpro ESA Hybrid or Wilbers WESA shock.
We have extensive knowledge of shock absorbers including motorcycle mono, twin, emulsion, reservoir, fully adjustable, hydraulic shocks, and shocks from OEM brands such as KYB, Showa, Marzocchi, our Hyperpro and Wilbers shocks, as well as their competitors. We cannot be outdone in our service by any competitor in the world of performance motorcycle shocks. Give us a try and we are sure you will not be disappointed!
 

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So it's probably something I shouldn't do in my garage? Sounds a little more complicated than just swapping springs?
With the proper spring compressor its easily a home project that only takes a few minutes to do. Be forewarned the process is simple but there is an inherent danger in this. A compressed spring contains a lot of energy just waiting to be released.

I posted EPM not as the people to change them but that they do have springs for OEM BMW shocks so you can change your own.

I have these and they work well on smaller springs on HD rear springs they are a bit unnerving.

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I'm too cheap to invest in somthgin better and safer. Hopefully I never have to wish I;d have made the investment in something like this:

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Yes, if the seal fails the bike will still "work" that's not a catastrophic failure. All the fluid can leak out the seal head can disintegrate and the bike will pogo but will still "work". A leaking seal is the 1st indication you are on borrowed time.

If you are inclined to change out your suspension for something more suited towards you riding style and/or weight shopping for it when you existing suspension is operational can save you some money and downtime. Kind of like looking for a new job when you have an existing job. You can pick and choose with no pressure to pick.
 
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