Am looking to replace the factory sights on my G17.

I would like the following specs (on one sight:)
- three dot night sight
- fairly wide rear window for geezer eyes
- a "ledge" shape - a la Heinie sights
- a "square" rear sight profile (i.e., no tapered or slanted sides)

Ameriglo Classics come close - but I'd still like the square profile. The Heinies come close, too - but I'd prefer the three dot to the "straight 8s" - and I can't find any 3Ds on their website.

Suggestions while I keep searching?

TIA

john