HI there
I used to have an H&E XJ-S … fortunately never needed to do the top. Only issue was the common oxidation of the paint, especially RED, which mine was before a guy ran a red light.
This is one thing I am almost certain you will need to go custom on.
Any experienced upholstery shop can do, no different than other convertible tops and interior work, etc.
They may be able to simply replace the worn section depending on your situation or needs.
Should I find nothing searching online, I would seek out some upholstery shops and speak with them.
One hopes you possess the wisdom, especially being on this forum, not to take it to some specialized, foreign car service, etc…
Body work is body work, a convertible top is a convertible top, etc…
Being in N Texas, as example, there are great craftsmen here. Many smaller machine and body shops, shops of all sorts about. Especially on the outskirts, less expensive, and do great work.
Hope you have a similar environment or seek out the possibility.
Otherwise, depending on situation, I would consider buying one of the later post 89 replacements online which are very reasonably priced on e b a y…
Uncertain of the precise differences, however depending if you find an upholstery shop or fella who can do the work but doesn’t have the material, it could be a great template, or even modification?
Worth seeking out the precise dimensions of the later model tops, perhaps a retro fit mod is possible?
Best of luck and update with what you do. It helps others.
Regards