Looking for mushroom-colored plastic "rivets" that fasten trunk interior panels

[askay]

These are the ribbed plastic fasteners that push in to hold the trunk interior panels and some other interior facing in place in my R129 SL500. Mercedes tells me it can no longer supply these fasteners in the mushroom color (p/n 14099004928F30) of the original interior (#265); they sent black instead, which just won't do. Does anyone have a stash or know of a source for these?