Weld in 4pt cage and soft top question

[rascal]

I am about to get a welded in 4pt cage for my track only car. (NB8A)

Is there anything special I need to be careful with to ensure I can still lower/raise the soft top? (Need to use soft top to be able to get in/out of car once on trailer) It looks like the softtop folds down into the space where the bars would go through the parcel shelf into the boot. Do the rear bars have to be a specific amount wider than the glass window to allow it to fold down between the rear bars?

[Alex]

Take a few measurments off a similar bar like the BD or the Torquebox for the rear bar spacing, they work fine with the softtop

[rascal]

Unfortunately dont know anyone with a BD or other bar to measure.

Is anyone on here able to measure their bar and let me know the measurements? pretty please...