So I'm looking for the part number for the block in my car and was not able to find it. I did fine these though:

oil pan part number:

GM 12581549

block: DR side rear side next to freeze plugs

3800
Series

nothing else in that area.

found a tag with a bar code on it above the bar code was BFL-R the bottom was difficult to read the first 5 digits but got 10RFL B0351736

looked on the web but couldn't find anything.

Thanks,

Jeff