The mount you've pictured is the stock rigid rail mount that came with the M600. The mount
@SanCap has indicated is the vibration absorber rail mount that came default with the Ronin MX. They are identical in "bolt pattern" and Rail dimensions. One is rigid and the other vibration absorbing post.
You can generally use the virbration absorber rail mount for the DJI payloads: 1) Ronin MX, 2) X5 Mount to mount X3, Z3, X5, X5R, and XT, and the 3) Z30 mount to mount the Z30 zoom.
If you have a camera or payload that doesn't use Ronin MX or the 2 DJI Camera mounts, then you're fabrication would be basically: 1) if you do NOT require additional shock absorption for vibration then you can use the stock rigid mount. 2) If your custom has NO shock absorption to isolate the camera from M600 oscillations & vibrations then you require the Ronin MX vibration absorbing mount.
As a 3rd option that can mount either the Ronin MX pivot mount or the X5 or Z30 gimbal mounts and additional options for different mount rails. For custom builds on S1000, S900 or M600Pro it provides a more "compact" mount and absorption tension can be finely adjusted for payload weight from light to full cinema camera.
Below is a link to 2 Mounts I had the manufacture combine into a group package to fit all needs:
It includes the 2 separate mounts and the wire-rope required for the square plate mount.
DJI X5 Mount:
Find many great new & used options and get the best deals for DJI Matrice 600 X3/X5 Gimbal Mounting Bracket (Part 1) at the best online prices at eBay! Free shipping for many products!
www.ebay.com
DJI Z30 Mount:
1 xDJI M600/M600 PRO Z30 Gimbal Mounting kit #14. DJIM600/M600 PRO Z30. 。3 - 4 weeks to Italy, Brazil.
www.ebay.com
Aftermarket Mounts:
Combo Dual Package and Full Wire-Rope sets:
Find many great new & used options and get the best deals for Upgraded wire damper mount for DJI M600+Wire-Rope Isolator Mounting+STO S12+Ship at the best online prices at eBay! Free shipping for many products!
www.ebay.com
The separate mounts are:
Find many great new & used options and get the best deals for Upgraded Wire Damper Mount for DJI M600 at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Find many great new & used options and get the best deals for Wire-Rope Isolator Mounting Plates Set for DJI Camera Gimbal at the best online prices at eBay! Free shipping for many products!
www.ebay.com
Find many great new & used options and get the best deals for STO S12 Wire Rope Isolator Anti-Vibration Mount at the best online prices at eBay! Free shipping for many products!
www.ebay.com