headset help

Can headset top covers be purchased separately?  Also, can anyone identify the model of the headset installed: the compression ring has "VP-A10RCK2" on it and the carbon top cover just says "Cane Creek".  I need a shorter headset top cover to accommodate a different stem. 

I recently purchased a 2006 Specialized Transition on the used market and the headset was listed as a Cane Creek unit (this did not come stock on the bike).  The bike does not quite fit me yet and I need to move the handle bar assemblys back towards the seat and I wanted to do this by using a different stem.  I found a stem that I believe will work, but it looks like I need a shorter top cover and a new 10 mm spacer to make it all fit on the stem.

The bike has a carbon steer tube and this is the setup that I have now (top to bottom):

• top cap
• stem (Specialized, 110mm, 10 deg, 38mm clamp height)
• 5mm carbon spacer
• 2.5mm carbon spacer
• 20mm tall carbon top cover
• frame

The total height of all of this from the frame to the bottom of the top cap is about 65.5mm. 

I did notice that both of the spacers were installed underneath the stem and therefore the carbon stem was about 2 mm  below the top of the stem clamp.  I prefer that the stem's clamping area is totally touching the carbon steer tube rather than having any overhang which is the way it was delivered.  The stem that I want to use would therefore require a new 10mm spacer and the corresponding top cover height is 5mm (the current one is 20mm).  The proposed setup would be as follows:

• top cap
• 10mm spacer
• stem (80mm, 45 deg, 50mm clamp height)
• 5mm tall top cover
• frame

The total height of all of this from the frame to the bottom of the top cap is about 65mm.  The stem clamp height goes from 38mm to 50mm due to the much steeper angle: from 10 to 45 degrees.

I am new to bicycling and I hope that I am using the correct nomenclature. 

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