[texhax] Inserting "rubber space" of enumerate label

[Victor Ivrii]

Normally in enumerate labels are right-aligned. However assume that
(with enumitem package) my label is

[label=Part  \Roman*.]

Since roman numbers (and in the lesser degree Arabic) have variable
length there is no left justification of Part.

Is it possible to insert a rubber space between Part and \Roman* so
that the result would be

Part    I. blah-blah
Part   II. blah-and-blah
Part  III. blah-and-blah-and-blah
Part IV. blah-and-blah

etc


Thank you very much in advance. Victor
-- 
========================
Victor Ivrii, Professor, Department of Mathematics, University of Toronto
http://www.math.toronto.edu/ivrii