96 evinrude 150, which exhaust housing?

[javelin150]

Need to order a outer exhaust housing for 96 evinrude 150 model e150eledb. There are 3-4 different part numbers for the same part, how do i determine which is the correct part. Shaft length is 20 inches. Thanks

[boats.net]

0340824 20" transom models
0341176 20" transom, 150SL, 175SL models only
0340731 25" transom models
0340821 25" transom models, 150JL models only

[javelin150]

Is there a cross reference for part 0340824 since it is no longer available to purchase.

[boats.net]

Unfortunately not, the only way to purchase that part is to find it used or aftermarket.