Ok, then I'm guessing it's an older model and has a long bell 34 on it. Some 34's have short bell. You'll just need one thats the same. The dimensions are the same on all 34 VM with that one exception of bell length. Some are short, some are long. There might be other differences, like which side of the throat the slide locating dowel is on but that really shouldn't matter as long as you have the slide to match.
I'm not really sure what you mean by a throttle stop screw either. Thats typically the idle adjustment as far as I know and they all have that.