Oil dipstick full mark
MP dipsticks come as a matched set with tube and stick. OP is absolutely correct that the distance out of the block is the operative question as the level of oil below the crank is the issue. But with unknown parts sources it is possible to have a mismatched tube and stick, and yes tube length and stick length was different on various cars with various options (AC being the usual issue). If the OP doesn't want to drain the oil, he sure doesn't want to drop the pan, so I'm not sure how the answer will help.