If Chili Palmer gets another Silhouette in the sequel to Get Shorty he'll be conforming to a trend that has benefitted Chrysler for awhile. Repeat buyers account for almost a third of Chrysler's minivan production, and word-of-mouth may be responsible for more than half their sales, says David Bostwick, Chrysler's director of corporate market research, He claims that about one-third of Chrysler's minivan owners stayed out of the market while waiting for the '96 models to arrive at dealers.