"two arrangements" is correct and usable in written English.
You can use it when you need to refer to two distinct plans or ways of organizing something. For example, "The conference committee had two arrangements for room seating."
But the two arrangements proved dramatically different in detail.
The commission said it was continuing to look at those two arrangements.
Where the second half hit its stride was in two arrangements that captured the variability of Mr. Jamal's style.
The £46.95m which these two arrangements help to generate are by no means the only aspect of City's revenue growth.
Two arrangements of mannequin limbs were not alluded to until a very brief video clip toward the end.
No two arrangements were ever the same and each one left guests with a lasting impression of the elegance and history of the People's House.
The only decorations were a few pumpkins outside and two arrangements of spider mums inside, the sort of sweet bouquets that probably sell well on Secretary's Day.
There are two arrangements of cylinders in common automotive use the vertical, or in-line, type (see part C of the figure) and the V type (see part D of the figure).
The mountain of flowers around the casket — including two arrangements of Mr. Diddley's trademark box-shaped guitar, in red roses and carnations — was so vast that they nearly obscured the pulpit.
Two arrangements of isoprene units are found in bicyclic sesquiterpenes, the cadalene and the eudalene types, and the carbon skeleton of a sesquiterpene may frequently be determined by heating it with sulfur or selenium to effect dehydrogenation to the corresponding naphthalenic hydrocarbons: cadalene, 4-isopropyl-1,6-dimethylnaphthalene; or eudalene, 7-isopropyl-1-methylnaphthalene.
The trombonist Conrad Herwig has played in a great number of salsa and jazz bands, and he has also put together two smart projects combining the two: arrangements of music associated with John Coltrane and arrangements of music associated with Miles Davis.
