pressure bleed clutch: which adapter cap?

[Ken]

Hello,

I might buy a Motive pressure bleeder, and I was wondering if I need a special cap to be able to bleed the hydraulic clutch on my '88 5kcstq.

I don't have my engine compartment with me to check the cap size, but I would like to order the product today if possible.

Motive offers a universal type of cap that is said to be usable with cap openings of less than 3.5" in diameter.  Perhaps I need this one?

http://www.motiveproducts.com/ordernow_bleeders.htm

Thanks,

Ken