D4 7u pre combustion chambers

Hi there all I am looking for a supplier of pre combustion chambers ( part no 1H -7653 ) for my D 4 7u , some bubba has attempted to mig weld up the existing badly corroded ones, the official caterpillar dealer here in New Zealand wants more than I payed for the whole machine for a set! Official cat parts are stupidly expensive here..

Current Chamber Numbers....
 [attachment=76427]D311, D315, D318 Pre-Com Chambers.jpg[/attachment]
 

Try DEPCO ,Andrew Turner may be able to help .Phone   06427 5746057  Based in Palmerston North
 

It has been some time, but I have gotten them from Regal Corp. My machinist was rather impressed with them for a after market part.