Need layout spec's for a B&S Vanguard 21HP 35 385777-0115

Can anyone provide the layout spec's (showing dimensions) for a B&S Vanguard 21HP 385777-115? I am replacing my B&S Vanguard 18HP 350777-1134-E1 which has a broken motor. I want to make sure my original muffler will fit it. I am putting the engine into a John Deere GT235.

The 350777 has already been rebuilt once 3 years ago, after the bolt holding the electric clutch on broke and when the clutch flew off, it crack the crankshaft. Therefore I had to put a new crankshaft in myself and I do not want to rebuild it a second time.

Briggs and Stratton recommends a replacement engine B&S Vanguard 18HP 356777-3137 for $1,338.00 ! I also have to make several modifications like taking flywheel & blower housing off old engine and putting it on the new engine and switching starters. Therefore, I rather not spend that much money on 11 year old tractor that requires modifications. B&S stop making the 350777 several years ago, and I haven't seen any used one.

Small Engine Suppliers recommends the B&S Vanguard 21HP 385777-0115 for $549 + S&H. The crankshaft, AMP/volts, keyway, drilled hole is all the same. I just want to see if the muffler will work. A local B&S dealer near my house said he can make me a muffler if needed.

Any other helpful thoughts would be welcome.

Thanks for the help.