warhawk did do a 37t 130bcd
Are you sure it wasn't a 110mm bcd? The Warhawk website doesn't seem to list any 130mm bcd chainrings at all at the moment.
If you're sure it was 130mm, do you know how it was done? There isn't room to go smaller than 38t with standard chainring bolts, and the chain is already riding on the tips of the spider with a 38t ring on a 130mm bcd.
For example, Ritchey managed to get away with a 28t 94mm bcd ring (29t is normally the minimum), but it needed special undersized chainring bolts and spacers, and suffered from a lot of contact between the chain and the spider.
Calmes dans le demi-jour
Que les branches hautes font,
Pénétrons bien notre amour
De ce silence profond.