There are actually several Pat, but some of them are not illustrated. Here are the illustrations:
[Linked Image]

Here are the part numbers:
[Linked Image]

P/N 392811 looks to be the same as your old muffler.
P/N 89966 is probably the long, symmetrical tubular muffler shown in the illustration.
P/Ns 292064, 295905, & 297934 are used on various other versions of the 80102 but are not illustrated.
P/N 91810 is a 45 degree exhaust elbow.
P/N 91943 is a 90 degree exhaust elbow.