Hi guy's. I recently bought a brand new heater core to suit a TJ. It was a genuine item in it's box. The box had the Mitsubishi sticker on it with the part number.
My question is, should the actual heater core itself have a part number stamped on it, as I cant find any numbers to confirm if it is genuine or not.

unlikely, may be a locally sourced item? , Calsonic?

Here's a shot with CAL on a sticker

http://www.aussiemagna.com/forums/showthread.php?t=66385&page=9

My new core doesn't have the foam around it. Is this something that you have to buy separate, or should a genuine item already have this on ?

Looks like you have to add the seals, elbows and weather stripping yourself.
Any hardware shop will have it.

Ok cheers guy's. I wasn't sure if I had an after market core in an original box. Just making sure. Cheers

The genuine replacement ones don't have foam around it like the one originally fitted. Get a roll of open cell adhesive foam stripping from Bunnings and attach it yourself.