GT6+ rear wheel cylinders

["Michael Bayrock" <michael_bayrock@bctinet.bctransit.com>]

     Yesterday, during my regular lunch-time walk, I returned with two new 
     wheel cylinders in my hands.  I've gotten 24 hour turnaround on them, 
     and they only cost me $16.00 CDN each.  
     
     However, they could only supply me with the 5/8" bore cylinders, not 
     the 0.7" that I think are the ones I need.
     
     For the record, I have a 1970 GT6+ (registered as '71), KC80064L with 
     rotoflex rear suspension.
     
     My questions are:
     
     - what bore size do I really need,
     - if I use a different size, what will be the effect, and
     - has anyone heard of "Lph Hydraulics" - apparently an Italian company 
     - and how do they stack up?
     
     Thanks
     
     Michael
     michael_bayrock@bctransit.com
     71 GT6++
     70 GT6+