Hy Beewrangler, a pressure plate with six retaining bolts appears to be 54 and newer, the earlier ones had nine retaining bolts. So your looking for a clutch from a 54 or newer engine, according to my clutch book in 57 all 3400, 3500, 3600, and 4000 series with a six cylinder engine used an 11" clutch, hope that helps.
