More diagonal advice

Hello. I am a super beginner, with the gift of an older Celestron C90 spotting scope. The scope came with an erect image 45 deg. diagonal that adapts the .96" scope opening to 1.25" eyepieces. My question: is there a 90 deg. mirror diagonal that would fit my scope and still adapt to the 1.25 eyepieces? I'm assuming this will yeild a brighter image but I can't seem to find one.

Thanks for any guidance,

David B

This one should work:

http://www.agenaastro.com/Antares-90-deg-Hybrid-Mirror-Diagonal-MSDH-p/odia-an-msdh.htm

Joplin