Do I have the wrong tranny?

I think I found why my crossmember doesn't bolt in.... I think I have the wrong tranny....

It's a 904.... But it only has a 14" tailhousing.... Arnt they suppose to be 18"?

If it was 18" I think everything would fall into place.... By a quick measurement....

So basically do I need a new trans with a 18" tailhousing....