D31A INJECTOR issue

I bought a Komatsu D31A-17 dozer with the 4D105-5H eng.It had a frozen engine and somebody removed the injectors to try to lube the cylinders to free it up.That was 4 yrs. ago.The injectors were lost.I got replacements from komatsu part # 6134-11-3300.It is the one that the parts book calls for. I checked. The problem I'm having is when I insert the injector in the head it lacks an inch from seating down on the head.If somebody has one of these tractors could you please help me resolve my problem could you possibly take a picture of where the injector seats in the head or possibly get me the actual part # off of your injector. I know this is asking alot but I desperatly need your help.Komatsu has thrown up their hands on me.......I need to find the correct injector for my tractor to complete my rebuild..........thank you