I'm going to drop the exhaust to replace the idler arm bushing, rather than cut the bolt.

I'm just not sure what exhaust seal rings I'll need and which exhaust nuts to get. I ordered a handful of each 14X10, 8X12 nuts and both types of seal rings just to have everything on hand and since they were cheap.

Put some anti-seize compound on any threads (including O2 sensor) for re-assembly?

What other unknown is there that would greatly cause me to reconsider removing the exhaust?

Thanks for any help, it is greatly appreciated as I am a novice.

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6