All, I am a novice so please go easy on me. I am also without my normal mechanic that has to usually get up to speed before working on LS tractors...so I have no one to get advice from.
Can someone tell me what the first arrow is pointing at? What is its function?
Secondly, on the second...
Not sure if this answers your question but I replaced my GB4000R with a Group 27. The dimensions on the 27 are bigger but I found it to fit nicely. I have a LS 3038H and my GB4000R lasted me almost 8 years! :D
The 27-DLG fit nicely and has worked great for about 30 days.