Just a heads up to anyone in the market...a 1973 125 SD was posted on 2/28 and a 1973 175 Jackpiner were posted on 2/24(with photo) over at Vintagemx.us. Both are MX models with the 1.8 tank and white plastic fenders.
The 175 looks pretty good!
Update - both bikes are still listed at VintageMX.us. The owner of the 125 is actually looking for a trade. The owner of the 175 is located in Indiana. Here's a link to a photo of the 175:
http://www.vintagemx.us/cgi-bin/largephoto.cgi?C=Hw5s8mSx4uqfNMbD