You may want to check the tool rental program here. As stated earlier you may be able to change your GPs W/O reaming but while you are in there a few more minutes is all it takes. I will also check my tool box I may have one, not sure if I sent it out for free when I sold my valve adjustment wrenches. If I still have it you can use it. I will let you know.
PS do not purchase Autolite brand GPs shortest life ever and at the same price as Bosch.