So this means there's no possible way that a 90 degree valve stem would work with the TPS right?
-Chris
No, it means if you want to replace the valve stem with a standard non-TPMS valve stem, you don't get to keep the TPMS. The one that Murph sells replaces the upper half of the valve stem assembly with a 90 degree part.
The ones shown in the eBay link simply replace your existing valve cap, and thread onto the stock valve stem. Other than their height and additional weight (may require wheel re-balancing), they should work just fine.
When I installed the Murph style, I had to add several ounces of weight to the opposite side of the wheel. It could have been the new tire I installed at the same time, but I don't think so.