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The PSI one looks alot like the old Pachmayer. They work fairly well but it's no Bomar.
You might want to contact Dlask. They had an adjustable sight for the GSG 1911 that was similar to a Novak in profile. They might be able to tweak the dovetail to fit
I bought the factory Sig, tritium adjustable rear sight (that works with the original front #8) from Questar: Not in stock at the moment, do the pre order and they'll bring them in for you. This will be the lowest profile set-up and still be adjustable.
There is not much out there for low profile. I also ordered a set of Meprolight True Dot adjustable night sights for my P226R off Ebay, $150. They shipped very fast all the way from Israel.
And...(just giving you options)... I bought a set of LPA sights from The Shooting Edge in Calgary. I broke the front sight installing them. My fault, not the quality for the LPA products.