Before I hazarded a purchase on eBay for the Model F, I actually thought about ordering a Model F from Unicomp, whose website states, under the "Replace IBM Keyboard" section, "Do you need to replace your old IBM buckling spring keyboard? Tell us the part number you are needing and we'll build you a new one, (with a Unicomp logo of course)."
Since they didn't limit their replacement services to just the Model M, I wanted to enter "6450200" on the part number field on the product page.
I would expect them to come up with something along the lines of "Nice try!"