I have an original oil tank for sale that was originally used on a 914-6 with a Sportomatic transmission. It is absolutely original and the studs are in the same location as a non-Sportomatic model. It will work on any 914-6.
There are an additional two fittings which are for transfer of oil to and from the transmission, but can simply be plugged if being used on a standard, manual transmission car.
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Rob