from the (Jan. '72) 1970-71 Parts Catalog:
BARRACUDA & CHALLENGER

2822 289 = CRANK w/PIN, Wiper Drive Variable Speed (same as '71 B-body)
2822 290 = CRANK w/PIN, Wiper Drive 2 Speed (same as '71 B-body)

2822 291 = LINK, Wiper Pivot Connection

2822 292 = LINK, Wiper Drive 2 Speed
2822 293 = LINK, Wiper Drive Variable Speed