I recently purchased a new aftermarket AAZ head and I need to know what valves it takes. The valve guides are 8mm so I think that makes it an early model, maybe 94 to 96 ish. When I look up the valves on ETKA it shows two different part numbers, either 95.6 mm or 95.5 mm. Does it make a difference? Can 1.6 springs, keepers, etc. be used on these?