My lift arm assembly is cracked around the oval tube on my 953b. If anyone is parting one out please send me a message!
Have it welded it will be fine if done right
These folks have several 953's in their scrap yard last time I went by - https://finneycorp.com/ Also check your local Cat used parts dealer. Not sure but the arms may be the same for the A,B and C models.
Can you show some pics. of the crack(s)?