Need help with installing rear speakers in Alto

Salam ! I planning on installing Pioneer 6993s in my alto, but according to my perception they won't fit because of very little space between the CNG cylinder and the board, as shown in the following pics. If some1 could help me find a feasible solution to this, i'd really appreciate it.
Also, i was going through the manual of the HU tht came FF with the alto. It said tht the HU has an option of rear AUX-in. So i took a 3.5mm jack-to-RCA lead, connected the RCA pins to the rear AUX-in of the HU and the 3.5mm jack to the ipod. Mayb many r already familiar with it, but it was something new for me so thought of sharing with u ppl.

http://cache.pakwheels.com/forums/2010/attachments/Car-Entertainment---Electronics/58513-Need-help-with-installing-rear-speakers-in-Alto-n-found-something-interesting-IMG-0923.jpg

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Here the pics of the RCA pins connected to the AUX-in:

http://cache.pakwheels.com/forums/2010/attachments/Car-Entertainment---Electronics/58521-Need-help-with-installing-rear-speakers-in-Alto-n-found-something-interesting-IMG-0932.jpg

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