You might be ok with those because they are longer. I went with the 56" version because shipping to Canada for the 67" version was insane, I was also worried about my front lip clearing the ramp.
This is the extender I am talking about,
Race Ramps Xtenders - RR-XT Lowered Car Ramps. works like a charm.
I would try your set up first. If the front of the car clears the ramps, you're golden. If it looks like the bumper will scrap, then buy the extenders and you should be ok.