>OK guys we know 51 and 51R's work great in Vairs, but what do I use in a 60? Well OEM for 1960 was a 457 with a 40 AH 557 optional. 557 is a group size 53 and was 13 1/16 x 4 3/4 x 8 5/16". Same two batteries are shown for 1961. The current "53" is a touch smaller, see http://www.rtpnet.org/~teaa/bcigroup.html and is about a half inch shorter than a 51. Padgett