I have a couple of modifications that make it easier to get the mounting bolts to line up and go in easier.
The first problem is that 2 of the captive nuts are very difficult to get a tap into to clean the threads out, especially after the boot area has been painted. My solution was to Dremel 4 cuts into a 3/8" UNF bolt which can then be run through the threads easily using a ratchet spanner. This is the shorter gold passivated bolt in the picture.
The second problem is getting the mounting bolts to go in square. Access for the front outboard and rear bolts is very limited and although the original bolts have a 45 degree point on them this doesn't really help you locate them. You often need to use a lot of leverage to get the distance tube aligned and you can't see what you are doing with those 2 bolts. The third one is easier and doesn't really need a modified bolt.
So what I do is to modify two of the bolts to make them easier to position. Buy 2 new 3/8" UNF bolts 2 1/4" long. First, turn a 45 degree point on the end. Then turn down the first section of the thread so that the bolt end is just narrow enough to slide unhindered into a 3/8" nut. Approximate measurements will be 8.4mm diameter and about 8.5mm length of thread. Now, when you have the bolt correctly aligned with the captive nut it will drop down into the thread and remain sitting parallel. This makes it a lot easier to get the thread started.
I usually Super Glue all of the rubber bushes onto the tank and glue the distance tubes in place as well to stop them falling off.
and now have found a fhc xk 140 
they must have employed very patient production line workers!!!!!
