Re: Carl's experience:

"the most trouble with parts which fit that description.
In particular, inner cowl, and inner-to-outer cowl."

We had the same problem with those parts from JC.

Images below:
left: Classic Parts (some are similar/same as JC)
middle: JC
right: JC
Attachments
outer cowl panels classic parts.jpg (229.35 KB, 184 downloads)
left inner cowl jc.jpg (46.14 KB, 179 downloads)
rt inner cowl jc.jpg (38.73 KB, 177 downloads)