We probably couldn’t have found a more fitting set of receptacles for the .375 pen than the “Revolver Pen Holder” and “Think Before You Ink Pen Holder”.
Both are on the pricey side, selling for $90 and $125 respectively. But you should know that each are hand crafted. The first is carved from a single piece of aluminum by industrial artisans in Mexico, while the latter is hand cast and made in Rhode Island. Both can be found at Uncommon Goods.