M50D-R1 ID# for a 1st Gen swap

[tweakedlogic]

My M5OD is getting louder and louder. Instead of rebuilding it, I've decided to swap in an HD unit.
I know the M5OD-R1HD came in the 2003-03 Explorers. But everyone keeps asking me for an ID #. Naturally, I don't have one. I've spent the last hour here at work searching, but haven't no luck.

Anyone know what ID I need to so I can swap in the HD into a 91 4x4.

Thanks in advance.

 

[tweakedlogic]

Surely someone knows what I need to tell the junkyards so I can swap in a HD tranny.

Please.

 

[csmall88]

I know this isn't exactly what you were looking for but it should get you close if you haven't already done it.
How to swap an M5OD-R1HD for an M5OD-R1