Bowens have had 2 different types of fitting during their history (as far as I know). The older 'L' style hasn't been made for quite some time and the 'S' fit has now become the norm. Pretty anything you buy that is descibed as Bowens compatible will fit this adapter.

GO HAND HELD: The included Battery Grip enables approx. 1 hour of cord-free runtime at 100% brightness when equipped with 2x Sony L style NP-F750 batteries, plus by no longer relying on light stands for support, the Forza 60B can now be used anywhere and everywhere, perfect for run and gun filmmaking, creative effects and event photography. Just to be clear, I currently have no affiliation with Bowens, WEX, or any of these other companies in question and I am writing and sharing this due to my own personal curiosity and interest, nothing more.

Snoot

The Forza 60 LED from Nanlite is a monolight style light fixture with remarkable light output relative to its small size. Weighing only 1.83 lbs, the Forza 60 employs a COB LED module to output 18820 Lux of 5600K daylight-balanced light at 1 meter. All while maintaining a high CRI/TLCI of 98/95, ensuring accurate colour rendition.

ENDLESS LIGHT SHAPING POSSIBILITES: The Forza 60 is directly compatible with a purpose-built line of Forza 60 light modifiers, while the included Bowens S-Mount adapter expands compatibility to a massive selection of light modifiers, including but not limited to Nanlite's line of full-sized softboxes and umbrellas. There’s one piece of info to take note of here and although seemingly innocuous, time will tell if it’s important. It looks like I got 9.9 mm for the height of the lug, where you got 9.7. I think that's where the difference lies. I have scrape marks across the top of it where I forced it to go on. All of them are like within .05 of each other. But apart from the mechanical challenges (the L type diameter is approx 16cm, the opening in the speedring adapter is 14cm, so some creative bending and shaping will be required) I wonder if the flash tube itself won't end up in a too shallow position inside the softbox. It already is somewhat receded in the old Bowens Mono Bronze and Solver units (I have of them myself, next to my Gemini's), and with the addition of the speedring adapter , with the softbox on top of that, may risk not protruding far enough inside the softbox.

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I have a similar, but different adapter to this that allows the speedlight to be mounted horizontally (which makes things a bit easier if you're using CLS / ETTL etc.)... works like a dream. COLOR PERFECTION - The output of a light is important, but without color accuracy, a ton of time and money will be lost in post-production. The Forza 60 features a CRI/TLCI of 98/95 meaning color reproduction will be precise.