Hello. First time posting here. I have a Ludwig mystery I'm trying to solve. It involves two mounted toms (12" x 15" and 14" x 16"). These are traditional double-headed toms that feature Maple Cortex wrap and Granitone (Lud-Cote) interiors with re-rings. The serial numbers date these drums to 1976, according to Ludwig's serial number guide. However, I can't seem to find any corresponding lugs that match what are on these toms. Unlike the "Classic" lugs, these are open at the bottom and otherwise smooth without ridges. Additionally, I can find no reference to the 14" x 16" hanging tom in any Ludwig catalogs of the time. The option for a large, mounted tom stops with the 12" x 15." Any Ludwig afficianados that might shed some light here?