A bit more searching and I found a reference to the Tampico bustle in the 'Strawbridge & Clothier's quarterly 1882' (which turns out to be an absolute wealth of information), and includes a listing for the Tampico bustle with length! Win!
|No. 50.—Pleated Tampico Bustle|
seven rows of pleating side pieces
length 12 inches. Price, 90c.
Strawbridge & Clothier's quarterly 1882 lists 7 rows of pleats not 6 like the one at the Met Museum, but I call that close enough to work from, besides 12 inches divides by 6 really nicely.
This pin does not cite references either however I am including it for completeness.
If you have any more information on the Tampico Bustle do share!