Cylinder casting #3021576?

[e46m3]

I am putting the 900 ('05) back together. I looked at the casting numbers on the exchange cylinders I got from US Chrome. One number is 3021615 the other is 3021576. The 615 I confirmed is an 05 900 cylinder. The 576 i am having problems finding. There is no hole on the back side for an injector so it must be an 05, right? I just don't want to put on 2 different cylinders. Any help would be great. Thanks guys.

 

[Jerseyrider]

the 3021576 is from a 2005. I own three '05s

 

[Jerseyrider]

Did you ever put the two different castings on your RMK. I have the opposite problem. Just got a 159 and it has the 576's. All I can find as a replacement ar 615's. All my other RMK's have 576's

 

[e46m3]

Yes, I put the 2 cylinders on that US Chrome sent me, The sled runs great.