Harry, thanks for the pic... and after much editing of this reply. Thanks for making note of charlies faq's... (#25 I think) where I found Dave Kemps notes which should be called "Everything you wanted to know about Driveshafts, But were afraid to ask!" In that tome I see he calls it the "anti-launch Pin"! So yes, the end of the driveshaft needs to reside in the rear-ends Input Shaft.
Re; the Fan, I didn't paint the shaft without the new fan. So I didn't have to worry about scratching the paint vs. sliding the fan over new paint. The clips are easy to remove with the proper tool to remove/install them.
As always, thanks to all for the input.
While waiting for the new fan, I should start doing the hydraulic cylinder and controls install.