It came with a guide chalk line already on it for the front of the frame.
After affixing the rear of the top the front middle was pulled taught, not drum tight, this left about an inch between their mark and the frames lip.
This is the link i used for guidelines.
http://www.wmbgbrit.com/install_new_top_mgb.htm
It is an ez on brand from the Carolinas, It fits nicely except the 2 snaps next to the top frame hinge behind the door. One is stretchable at 1/2"off, the other is not at 3/4".
After 2 weeks on, and several Texas heat cycles, that one snap still cannot be stretched to the frame hinge without popping off. The extra vinyl from the top was made into a double sided snap spacer.
Btw the zippered rear window is worth the extra $20.
It streches some when driving, but becomes taught again soon after.
After a couple of monsoons, there have been no leaks from anywhere.
--------------UPDATE 9-28-2016
-Fall has arrived in Texas. All 2 weeks of it.
- Cool, dewey mornings and warm afternoons.
-After driving with the top up I found that the fresh air flap behind the radio flows better air at the footwells if it is in the first or second position.
-With the top up you can distinguish what song is on the radio at highway speeds.
-The center dash vents blow a hellish amount of air with just the wing window cracked open
-Also found that my gearstick doesn't buzz if the shifter knob is removed. Can't tell why. Going to try to pour some caulk down it before screwing it on and see if that stops it.
-Had to adjust the toe in a bit there was some feathering on the inside of the fronts. May need another 1/2 turn in.
-Doral tires are wearing nicely, are quiet, and predictable around corners.
-The latest mpg was 26.2 with moderate throttle driving after starting fresh and re-tuning the carbs.
High was 27s with them leaned some,
-I found that the odometer ran 0.1 miles high according to highway markers.
Not bad for a 44 year old pushrod 4 banger with dual carbs.
-I'm thinking an electronic 45d distributor is in the works. When that transpires- you'll be notified.
