The original factory sight on my Colt Government Model 45 looked a lot like yours - and I didn't like it -
I had an after market sight replaced by an incompetent gunsmith (discovered too late) he installed it backwards even after we discussed it in advance -
I found a good gunsmith (hard to do) and followed his advice to install the sights as a matched pair - his fee was nearly twice the cost of the sights from Brownells - but - both were well worth it.
Good as he is, even his first staking of the front sight came loose (as mine have in the past) but, he did it right and it's still in places after thousands of rounds.