Yes good to hear from you too!! ahh the old days! almost 10 years ago I started this hobby! getting my USPD in the summer of 2003! mainly using the PA board back then with Randy Draper and Joshua, Joshua was very helpful back then and I loved his very British sense of humor for a Canadian
To answer the OP yes I do have the original motor but I think its also blown, it did last a long time though, all of these motors with the potted controllers werent that reliable, fitting an external controller as I did really puts the bike in to a different leauge however I used to love the simplicity of just the standard motor at times, although the speed isnt as quick they still climb hills really really well even using old lead acid batteries at 24V.
I do have Kollmorgen motors that you could just bolt straight on, however they aren't quite as fast as the original BMC but they have more torque so better for hill climbs so you would be better using one with an external controller like on the video, pretty much any brushless motor controller will work with the Kol or the BMC, I can provide you with the full wiring diagram for the Kol to your USPD or contact Fechter on this forum as he has modified the BMC as you may have seen on those links.
You may be better to get the BMC motor from the US though and see if they will mark it as a low dollar item and get it on the slow boat to save you some carriage costs and avoid import duty? most Vendors will do this.
The other thing is try contacting Tony Castles at electrodrive in the UK, he is a very helpful chap and was the fellow that I got my kit from in the first place, check his website out on http://www.electrodrive.co.uk
or on his other site http://www.mr-motorvator.co.uk/
he might have an old motor kicking about.
I notice that you are using the lever throttle on your bike, a nice upgrade is the Magura twist throttle, I have a link buried on my old website here, a nice option if you suffer from the old achy thumb, it was the first modification that I did on the bike. http://knoxie.ath.cx/new%20site/electro/page-7.htm
there is also a few other bits on that old site worth checking out too.
Another contact stateside worth checking out is Scott at ev deals too, check his site http://www.evdeals.com/
as he also used to stock the motors.
The USPD is still a great unit and formed for me a very happy introduction to this hobby, I have now moved on to hub motors in the main although I still run a modified USPD on my KMX cart, geared hub motors are a very good replacement for a USPD although you will have to also run an external controller, there is plenty of info on this site to help you out there.