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Holosun HE507-C <> Mount for Ruger MK IV Lite

I'm hopeful someone can lead me in the right direction for mounting the Holosun HE507C.
So far I've found one option at Definitive Arms, but out of stock. I'll wait if necessary.
Are there any others I could consider?
Like I've mentioned previously, I'm learning as I go.
I emailed to ask my dumb question, whether he had a mount for my Holosun.
He replied, the red dot you have is RMR compatible, which means it will work.

Does anyone else have any feedback on them?
I'm concerned with long-term rigidity, being as the shoe that goes in the dovetail is aluminum.
Thanks for the bit of info.
The Vortex Venom appears to be more common than other red dots being used.
Based on images found via Google, anyway.
Finding a 507C on that Shadow mount is challenging in itself!

Update - Shadow Mount on the way!!
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