Its been a while bit i have been back in the workshop fitting more bits to the ever lasting project..
I bought a non genuine quick shift and couldnt get it to fit until i had a good old plat about and here is how to fit and get them to fit with not problems at all...
First disconect the origional shifter which is easily done as it is siply located by two pins on either side of the housing.
Youe should then be left with the two locating pins.
These need to be popped out.As long as you have a good punch set select the required punch and they simply tap out with out having to un bolt the housing or disconect the linkage.
once both pins have been tapped out you will be left with two holes which the bolts on the quick shift locate to securing the quick shift unit to the housing.
My quick shift didnt fit properly in the place of the old one as the purple housing which attaches the quick shift to the origional housing didnt sit properly, causing the securing bolts to miss the two holes where the pins were tapped out of.
To solve this problem i took some rough graded wet and dry and sanded the nylon ball on the end until the quick shift unit sat in the housing correctly. It took a few attempts but in the end the quick shift fit fine and the two bolts which secure it lined up with the housing and sat in the holes where the pins were tapped out from.
i took the car for a spin ans selecting gears if fine better than before.I was worried asa i no it was a non genuine quick shift but with a bit of easy adjustment its fine. I got it from our favourite on line auctiopn site and was less then half the price of a KAD one
Hope this helps any

Phil