Don't know if this helps but I have an ORIGINAL (righty)Fender bass case from '72, a lefty P-Bass fits fine, a lefty Jazz has to go in face down to fit.
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Are you referring to a G&G Fender vintage case? If so, it should fit. My lefty fretless '78 P came with a newer G&G Fender vintage tweed case, and it does fit, though not perfectly. The bass's E string tuner does not quite clear the neck indent(?) of the case, but the case will still close fine. All that needs to be done is to elevate the bass slightly within the case to clear the tuner to get the bass to sit perfectly in the case's neck well, however, i.e. put a towel or something under the heel of the bass. But I've left it as is for now since I'm too lazy to remedy it.
Thanks for the responses, guys. It sounds like it will work; I just didn't want to plunk down $150 on a case that didn't fit. I figured if worse came to worse I could remove the section that the neck sits on and flip it around (it appears to be longer on one side). Special thanks to Addison for the quick photoshop job!