You can buy replacement heatsink holddown parts directly from coolermaster....
If it fits an Intel 1155 socket heatsink pattern it will fit.
It uses a 75mm x 75mm square hole pattern.
Other PC heatsink manufacturers have similar replacement items.
There are also many flavors of waterblock mounting hardware that could be pressed into service.
The hole pattern is an industry standard.
How are people justifying the expense in this? It sounds like we're back to being GPU hobbyists again, except this time with an even greater lack of understanding of what we're working with. Not that there's anything wrong with that.
But just for reference; Spending $100 USD on aftermarket fans will set your ROI back about 30 days. Are people really considering water cooling?
Most people (original Titan owners) made 2x-3x or more of their initial investment, so it is pure profit to run them now. Unless someone bought an expensive secondhand Titan recently, then ROI is at least 12 months w/o any added expense.