Chainsaw Repair

Looking to either find a 19/31 ID "Spur" sprocket in .404 with 8 pins. OR a better B&C combo in 1/2 inch. I have 1/2 inch loops 74 and 87 links.

Al so am I correct if I take bars from some of my mac 250s will they work on my 5 10 geardrive

There's another thing about older McCulloch hard nose bars and actually about any of them,10 series included .For reasons unknown to me these thing could come in about every gauge known,from .050 to .063 .I was given a 32" 10 series with a .404 sprocket nose in .050 gauge .I didn't even know they made .404 in .050 until then .I changed the nose to 3/8"
The 48" McCulloch hard nose on that saw in my avatar is in .058 .I had a time even finding .404 in that gauge .I can't imagine it but I've learned they made 1/2" in .050 and .058 .
I might mention that avatar saw also has a Stihl mount,066 size ,36" .404 I adapted using spacers .Not all Stihl mounts would work because the tail section is too narrow .Adapting bars can be a chore at times but it can be done with a little luck .