steering coupler replacement (how to)

I got the Borgeson joint in today. Spline side is way too small. Tried persuading it with a rubber mallet and no go. Ended up calling Flaming River and they confirmed that Chryslers 5/8 is bigger than the Universal 5/8 which is why Boregons U joint doesn't work. Luckily Summit did an exchange and I now have a Flaming River U Joint on the way. Third time's a charm right?