What's a Vacel?

The Vacels started out as a Long Island Doo-Wop act called Ricky & The Vacels. They had a few earlier releases the Express & Fargo labels but I've never heard those. The band dropped the 'Ricky &', added some horns and signed to Kama Sutra Records in 1965. "Can You Please Crawl Out Your Window" was the band's second single for the new label. The Vacels beat Bob Dylan's single of the same song to the stores by several months. I wonder how they heard it?