This is a customized part for this model:

https://www.makeronline.com/en/model/Kobra%20S1%20-%20ACE%20PRO%20Riser/159078.html

It will replace the rear-most rod (one of the two smaller rods) and serves as buffer bracket - the basic idea is from this model: https://www.makeronline.com/en/model/ACE-PRO-buffer-bracket/158637.html

As a litte extra, the power- and control-cable of the ACE can be tied down to it.

Be aware:

• the original power-cable is really stiff - it is not advisable to lay the cable along the same route as the ptfe-tubes, at least you shouldn't tie them together. I used a different one.
• if you use a stiff or heavy cable, double check, if the model will last; its not designed for heavy force applied to it
• The buffer (=ptfe-tubes) must be able to move freely. So dont tie the tubes too near to the ACE together + leave some space behind the ACE.