O-320 H2AD carburetor PN?

[kep5niner]

My 1978 172N is going through annual now, and we may need to replace the carb. It’s the O-320 H2AD -76 series. I’ve got conflicting PNs from what the Lyc illustrated parts catalog calls for, and what’s on there now.

The existing carb is Marvel Schebler MA-4SPA PN 10-5135. The Lycoming IPC calls for MA-4SPA PN 10-5217.

Any idea which is the correct carb PN? Spruce has them both on-hand. The latter PN is about $100 cheaper. Thanks.

 

[kep5niner]

May have found the answer, or at least got closer. When looking at the 172N IPC, the PN for my SN 172 is LW13659. When looking at the Marvel Schebler website, that crosses with the MA-4SPA PN 10-5135, which is the PN of the carb currently installed.

 

[Gary Ward]