Is there a 5 speed swap for a 1990 HiJet van S82V?

Greetings Y’all from Texas, USA. I have a 1990 HiJet S82V. It has the original 4 speed transmission. Out here in the wide open spaces of Texas, it could sure use another gear. Has anyone done a 5 speed swap for these little vans?

Here’s an image gallery showing a 5-speed Hijet/Porter box. If the bellhousing’s bolt pattern matches, it shouldn’t be a big deal, to bolt this in place of the 4-speed, without major alterations:

Here’s another one of which the bellhousing pattern looks entirely different: