3.0 Exhaust Manifold/Riser/Elbow PNs

[nrasnake]

I'm going to buy a new manifold and elbow/riser for my mercruiser 140 MR (SN 6891354) with the MerCarb (2" x 3-11/16" bolt pattern).

Can anyone confirm these part numbers correct:
OEM: 806867A8 / 99798A9
BARR MARINE: MC-1-99798
SIERRA: 18-1956-1

The iBoats exploded view parts list says OEM PN is 99798A18. Not sure which is correct, or what the difference would be. Mercruiser GM 4 Cylinder (120, 140, 2.5L, 3.0L) Sterndrive Exhaust Manifold Exploded View - iboats

For the elbow is this the correct PN?
OEM: 12076A1
BARR MARINE: MC-20-12076
SIERRA: 18-1975

The iBoats exploded view parts list says OEM PN is 12076A2. Again, not sure which is correct, or what the difference would be.

Would I still need the riser (the extension piece between the manifold and elbow), or is this elbow extended so that I no longer need the riser (which apparently is no longer available).

Finally, has anybody ever heard of or purchased from Engines1? Their prices seem too good and that makes me nervous.
MC-1-99798 Mercruiser 4 Cyl Manifold - Engines1

Thanks

 

[smassey22180]

Re: 3.0 Exhaust Manifold/Riser/Elbow PNs

I like to get my OEM part # from here Mercruiser by Mercury Marine parts lookup and ordering Then I search for those oem part # on iboats.