need help finding seller/distributor of heat sink

[ttyridal]

A lot of marine/automotive electronics is delivered in this type of heatsink (pic) leading me to think this is some standard type.

Unfortunately my searching skills are unable to locate a seller / distributor. Does anyone know where these can be found / bought in "hobby quantities"?

Cheers

[ttyridal]

Never mind.. I was fooled by the "end plates". For some reason I've been thinking they where an integrated part of the heat sink