Can some confirm for me the following info, Is it true that for a 69 camaro the 410 gears rear end was only avaiable on a coupe and not for the convertible the highest gear ratio available for a SB SS convertible would have been the 373 gears?

My copy of the 1969 Power Team data does not indictate that covertible or coupe was a deciding factor for SB SS.
It indicates that with RPO-Z27 (SS 350CI) "All Models" WITHOUT Air Conditioning and WITH a 4-Speed Trans could get the Special 4.10:1 ratio as long as Positration was ordered also.
Z-28 and COPO's list availability as 12437 (coupe) only.
Hopefully Jonesy or others will chime in if this is incorrect.

Yes, but all Z/28 and COPOs were coupes.

So can any others give some input on this subject so as to confirm if 4.10 gears were available on a 69 camaro convertible SS 350

The 4:10 rear was a special order on all L48's without Air Conditioning, regardless of body style. It was available only as a POSI rear.

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