Bing Carb Diaphragm

Are there any suitable replacements for the diaphragm? Or are the rotax name brand ones the only ones that should be used?

I found this source and it's significantly cheaper than all the other places that are "Aviation" based.

http://www.capitalcycle.com/Diaphrag...ING_p_290.html

Also perhaps there are other things relating to the 5 year rubber and carb flang that can be sourced else where than Rotax?

I use the bmw ones.They appear identical to the rotax but less than half the price Probably the same manufacturer,the box is identical to the rotax one!

Do you have any other preferred items on the carb rebuilt kit t hat work well?