I found this to be the best L- Bracket for the A7r4 as the short edge arcs swiss plate is complete without the cut out present on other models. the Amazon listing for this has been updated to show it is also compatible with the A9 mark 2. This was £58 new and no longer available. SmallRig L-Bracket for Sony Alpha 7R IV LCS2417 For Brands: Sony For Models: α7R IV SKU: LCS2417 1. Dedicated Arca-type L bracket for Sony Alpha 7R IV 2. The side plate can be moved to the left for cable tethering. 3. Built-In 1/4”-20 threaded holes and strap slots. 4. Integratedflat-head screwdriver for easy access on the side plate