Can you define "tall" and "short" or post a pic? I'm used to seeing just a threaded boss about an inch high on an oil filter mount. But as I've mentioned in other posts, this is my first Dodge slant. My oil pump looks like this, with 6 bolt holes.
Your picture is the early pump which requires the tall filter. The newer version of the pump has a short threaded nipple about an inch long. Ebay has some of the newer pumps listed. You can look at them to see the difference.