Yes makes good sense. I can see that the flat back would ensure the blades aligned correctly.
Printable View
SJE has the cutters. I bought a set for the same thicknesser.
I buy from Aliexpress on a regular basis, usually inks for my Epson printer, paying usually around $11 for a full set, delivered, and they work fine. I bother because I have found so often that like the inks, the same items are available for a fraction of the price, and are worth a try at least. I had a large commercial size HP Plotter, worth new over $10k, but had sat neglected for a few years. With a set of inks and a drive belt costing over $400, I took a punt on a $5 belt, and a $46 full set of inks, and they were all perfect. I also recently bought a carburettor diaphragm on Aliexpress for $9.90 delivered vs $55 everywhere else I looked.
So in my experience it can definitely be worth a look, and the savings significant.
In this case I couldn't find the same cutters, though it may be just because I don't have the right terminology, so I have today ordered the set from SJE for $108 delivered.
I also today paid $693 for the Hafco T-13S thicknesser, which will probably get delivered Friday or Monday.