63 Impala SS powerglide q's

So my car has a 2 speed powerglide but the dilema that I'm currently having is that there are various different length dipsticks available? I purchased my car with what seems to be a oem powerglide with the tube intact but the dipstick is missing, how can I tell which length powerglide dipstick my car requires??
Please help???

Thanks in advance
Ralph






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