NOS Exhaust Questions

[neuropel]

(Part 1 of 3)
I recently purchased some NOS exhaust pieces and I'm looking for clarification on some of the part numbers. The first picture shows three NOS downpipes. Note the top two are identical, and the bottom one is similar but slightly different. Part number for the top two is 1 8 54 242 (see pic). The part number for the bottom one is 1 8 54 227. The second and third pictures are side-by-side comparisons to show the differences.

[RallyBob]

I recently purchased some NOS exhaust pieces and I'm looking for clarification on some of the part numbers. The first picture shows three NOS downpipes. Note the top two are identical, and the bottom one is similar but slightly different. Part number for the top two is 1 8 54 242 (see pic). The part number for the bottom one is 1 8 54 227. The second and third pictures are side-by-side comparisons to show the differences.

Bottom one looks like a 1.9 Kadett pipe. Should be 1 5/8" main tube diameter. The top two look like Manta/Ascona pipes, and should be 1 7/8" main tube diameter.

[neuropel]

A second set of down pipes included the two pictured below.
Can someone confirm what these fit?

Thanks,
Todd K.

[neuropel]

Final pieces in the lot included this Opel-Isuzu stuff. Any ideas on whether there's an enthusiast group out there possibly interested? Otherwise it's scrap...

Todd K.

[RallyBob]

A second set of down pipes included the two pictured below.
Can someone confirm what these fit?

Thanks,
Todd K.

These look like a copy of a GT headpipe.

[neuropel]

Actually, they're both GM NOS pieces and still have the tags/stickers - it's just that one of them has surface rust.

[opelspyder]

The top two are for a 50 Series Manta 1900, the Bottom one is for a 1.9 Kadett or 1.5. According to the parts book
Keith

[opelspyder]

The post #3 pictures are for the 1.9 GT, the last pictures are isuzu stuff. I remember seeing this on ebay, I figured the ones were Isuzu with the cats on them, but I knew there were some Opel ones as well