i just checked you are absolutley correct for some reason i thought 64.5 was stock my bad i will take pictures with a measuring caliper and post them later on today sorry for any confusion.
yes stock head cylinders are steel available and compleate top end is available ive sold two sets prior and no problems i actually send a set to kuwait i will never do that again i will take paypal that way it will be a secure transaction for both of us let me know who whants them aim ready to send you guys my paypal addy upon request