3Y/4Y starters

[JDM VANMAN]

So I'm replacing the starter in my Townace which has a 3Y motor in it, I know there's a different part number is used for the 3Y and 4Y motor and I was told by the parts clerk that the bolt pattern was different between the two.

I ordered a Denso starter for my 87 van and I just got one for my 89 Van with a 3Y motor but they look exactly alike? Some sites say that all starters are compatible from 84'-89' and some say that they are different. Does any one know if this is true?

On another post I said the bolt pattern was different and that's what I was told by the parts clerk. But now with both starters in hand I think they are the same. In the photos to the right of the picture is a Denso starter and to the left is a Beck Arnley reman. When I ordered it from Rockauto they stated that it was a Denso rebuild but I got a B/A starter instead. I wanna return it and just get a Denso starter.

If if anyone knows first hand that would be very helpful.

Thank you