dayvkl,
Welcome to TBN forums!
Those sections are smaller than most, but I think you can find what you need at this website:
sickleservice.com
But be prepared for "sticker shock" (about $85 for 25 sections as of Sept. 2008). That's almost three times the cost of "normal" size sections. Supply and demand....
Scroll down to the bottom and you'll find part numbers 207-230 (smooth edge) and 207-231 (serrated edge). Those have the correct hole spacing (1-3/8"). If you click on the part number, you'll get a very large picture of the section. I shrunk the picture until the hole spacing was as specified, and then measured the width and length. The width was 2", but the length seemed to be a bit over 1-3/4". If the sections are too long, they might interfere with the sickle guards (if your sickle bar has guards), but there should be a little clearance. In a pinch, you could just grind 1/8" off the tips of the sections.
They have a "contact us" link where you could send them an email inquiring about your sections. Maybe you can get a smaller quantity; it doesn't hurt to ask.
For the parts I mentioned above, they list a price (Sept. 2008) of $3.37 and a quantity of 25 (that's $85.25 + shipping). It's painful to think that they want 3.37 each
and force you to buy 25 of them. On the other hand, you'd probably have enough sections for the life of the mower.