[reelapeelin]

These sliding hatches are fairly intricate ordeals...my '74 hatch is as follows:

overall front to back-22 1/4 "
overall width-25 7/8"
width under windshield-26"
back height-2"
front height-1 1/2"
flange under teak-approx 1/2"ea x 18" long
gap sliders ride in-5/8" clear

Now under the windshield it gets complicated:
from front to where windshield seats-19 3/4"
windshield seat-1 1/4"
windshield stop-1 1/4"
on the sides of the hatch; 45* angle starts 18" from front to where slider mates-up to hull in closed position...rise and run of the angle-1 3/4"
after angle, there's a 2 1/2" overhang that includes windshield seat and stop as above...stop is approx 1/4" tall

Franco, if you need more, I'll get it...just let me know...
;)...Oz