I suggest you use a penny or dime (or small coin in the currency of your local government!) placed on top of your current hit points and your current number of deaths. Other ideas: small pieces from other games such as Risk armies, a standard sized d6, a generic wooden cube from any eurogame, etc.
The current life total maximum for any character is only 130, but there was room to put 140, so in case the expansion changes that, you're prepared.
55 is overrated. Sadly, I left the original @ work and won't be back for another week and change. So I guess for now write it in (or change 140 into 55, confusing, I know) and I'll fix it up on Jan. 3.