Thanks Raven,
Lisa does do business with Canadians and it's excellent. I looked up the part on her website a couple of weeks ago and it looks like the same part number for the 1860 conversion and the 1872 open top. I'm assuming that is the short version. However, I have some parts to order from her so I'll ask her when I phone. Heading out for three weeks of shooting in Montana and Wyoming on June 5th and we have a postal strike starting possibly Thursday so I'll put things on hold until I get back in July.
Thanks again for the info
NTJ