Did the shop install wrong MAF?

About two years ago my car was randomly stalling on me (automatic transmission). When I took it into a shop to have it fixed, they told me that the problem was casued from a bad Mass Air Flow meter. I told them that I wanted it replaced with a aftermarket one and they suggested a Pro-M. So, I had them order one and install it and it seemed to fix the problem. Today I was curious to what pro-m meter they installed since on the reciept it only told me pro-m meter. The sticker on the meter gave me this model number:

model: 75mm bullet
part #: 75bp m93

Now when I look this up online, it tells me that this particular model is for 89-93 mustangs. I noticed that on the one they installed they cut a piece of the meter on to get it to fit. This has me worried and since its been over two years I don't think there is much I can do if I call them out on this. So I figured that I would post on here to see what you all thought. Maybe this model works for 95 gt's I just dont know a whole lot about this. I just hope I wasn't cheated. Please Help!

But when installing a CAI, the MAF needs to have the flange on it to bolt it to the tubes. You can see where they had to cut down the 88-93 model to make it fit in the stock MAF housing. The 94-95 model has the flange and requires no cutting.

The check engine light has always been on since they installed it but I thought that was due to something else. The guy at the shop said the Pro-M told him that it would be fine for him to cut down the plastic meter housing to get it to fit inside the stock box. I also just got off the phone with Pro-M and the guy said that they would have absolutley NEVER told them that and in that he would have never recommended putting in a meter that is not for the years specified. He said that my only option is to get it recalibrated with a new housing ($175) or buy a new one ($210). It just really makes me mad that this shop would do this to me.

At the time when I brought it in, (it was actually 4 years ago and not 2 like i posted earlier) I knew very little about engines. I have learned a lot though over those 4 years. Right after I picked the car up from the shop and told my friend how much I paid to have them install it he was suprised and was able to show me how EASY it was to install. I am going to go in there tomorrow and make them order me the right one so I can install it. I will try get some pictures posted soon. I feel like an idiot about this since it was such an easy install.

But the main thing is that they told me they sold me a meter for a 94-95 gt when they actually sold me the 88-93. They lied to me. I think I will be getting a new one from them though.