Rear frame holes 70 240Z

Hi all,

I need some help identifying convenient holes for spraying the interior of the rear frame rails and cross members with anticorrosion spray. The attached drawing made from the chassis dimension drawing and measurements made on my 70 240Z shows two holes under the carpet in the back of the rear deck that may be of use. I also know that there are two large suspension bolts on the bottom of what I am calling the front crossmember on each side that potentially could be taken out temporarily. Are there other holes? I don't know if the one the gas tank J Bolt goes through on the passenger side frame rail is big enough for any useful spraying.

Thanks for any ideas on making this info more useful, I realize I will likely have to drill a few holes but want to minimize them and want to choose locations for them that do not require taking anything off of the car if anyone has any thoughts on that. I showed the drawing to someone who said where are the dimensions? Well the drawing is to scale and when I am done I will put it on my blog with dimensions in case this is of any use to someone else.

Mike