Well, you would think. But Wally measured the inductance on a working L2 and I have never seen an adjustable inductor in the needed range on any of the surplus electronics, radio, and ham sites.
Litz wire seems easy enough to get without winding one's own. At least, there's a guy on Ebay who sells quite the variety. Using the same gauge and number of conductors will help match the total resistance and current capacity more closely.