I buy a few insignias at the min as I have mastered these gearbox repairs.
I bought one the other month that was a 1.8petrol fitted with the f40 box which is just as a crap as m32. Basically as always 1st and 3rd were moving the gearstick and the normal wine had started. We took the box out, stripped down the box measured the bearings and bought them from bearings online, cost £58 with postage fitted back together with a tube of box sealer £9 from motor factors and good as new.
Top tip is to replace the slave cylinder if the bearing is noisy (thrust bearing noise) however they are £160 new , ours had a tiny wine when depressed, we greased it up and it was like new. The thrust bearings seem to dry up really quick.
so in total is costs about £90 to rebuild the box, Older insignias around 09 10 plate are peanuts now at the block always under book as dealers are trying to budget in box rebuild.