My hub has the splined carrier and has a chainline of 57mm. Can have a look on the box, to see if there's any mention of what model of carrier it has.
I don't remember there being a 'slim' option at the time. Might have come about later, due to demand.
Thanks.
My guess is that 57mm is standard, as they refer to 57mm on their site and it's the slim version that is differentiated.
There seem to be a few 54mm specific things (eg Middleburn spiders), so you're likely right about there being a demand for a 54mm carrier.
@BareNecessities started
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My hub has the splined carrier and has a chainline of 57mm. Can have a look on the box, to see if there's any mention of what model of carrier it has.
I don't remember there being a 'slim' option at the time. Might have come about later, due to demand.