Tom,
I know some time has lapsed from your post but I have a 2001 Holden Astra Convertible Bertone and have suffered from the same issue broken roof latches the dealer quoted $1400 (+ GST.) each for new latches.
Fortunately I manage a machine shop that has tackled many cost saving modifications to automotive components for many customers in the past furthermore could not believe a replacing each roof locking device could cost $1800 (x2 = $3,600 +GST.). So our company ALNO Product Services have come up with a method of modifying the latch so it continues to operate. It has been working for over six months now and will keep this forum updated on how long it actually lasts.
Anyway to modify both latches cost $1850 (+GST.) and the dealer charged me $350 to remove and fit both latches the whole process took less than one day
If you or anyone else needs additional information on getting broken latches fixed part No. 0919 8575 and 0919 8574 or you may like to see the modified latches working they can contact me at ALNO Product Services on the central coast or Google ALNO Product Services Wyong NSW Central Coast.
ALNO Product Services have a list of businesses around Australia and New Zealand that fit the roof latches to find the closet latch fitter close to you call ALNO Product Services Today 0477 002 249
Fatboy@ALNO
