The 404v is the
Volvo version with metric bolts and spacing to fit
volvo couplers. It is a non standard item. I have one, but not
for sale. Despite all the on-line places saying they are not in stock, go ahead and order one. They are made to order and ship pretty quick, or at least mine did. Unless you don't have a volvo engine/coupler. In which case don't get the 404v.
More expensive than it should be, however.