42A 933 excavator that needs undercarriage.  Understand that undercarriage cost usually exceeds worth of the machine, but the rest of the tractor is in good shape, and I'm willing to do a fair bit to keep it usable as a farm machine.   What are the options, as it seems many parts are no longer available.  Am I correct that D2 is the same? Any alternative later model components that will work?  Any weld-on options for sprockets?  Source or dimensions for a wear guage?  Thanks in advance for any ideas. 

42A 933 uses D4 chains and rollers, sprockets are D4 size on the rims, but the sprockets are D2 style, don't know if D4 rims are the same diameter.

Hi Team,
from the Undercarriage Custom Track Handbook is a range of weld on sprocket rims--D2/933 are given.
Cheers,
Eddie B.

Looks like the sprocket rims may still be available.

www.amtequipmentparts.com/undercarriage/...rocket-rim-23-tooth/

I have some good used 42a sprockets,idlers and rollers but should be too far from you

Thanks Gemdozer, where are you located?

I am located SAINTE-JULIE near MONTREAL CANADA

Thanks much, not out of the question, but a good distance, about 18 hours. Let me explore closer options, but I appreciate the possibility, and may follow up before this is over!