Dome light on a 2001 regular cab question

[stan]

Sorry about yet another dome light question, but I've looked through pages and haven't seem my question addressed. Anyway, I bought a new dome light a few months back and today it's in the 60s (finally) and I wanted to do something with the Ranger, so putting in the dome light was quick and easy. Or so I thought. The replacement light has a long tab on the back of the housing and it won't fit in the opening. I'm wondering (after looking at all of those threads) if I have a dome light for an extended cab and those have a different opening in the metal. (The truck had NO dome light when I bought it a few months ago). It's a later 2001 as it has the 2.3 Duratec.

TL;DR -I'm wondering if I have the wrong dome light for my later 2001 regular cab.

Thanks.