Sorry this isn’t a direct answer, but you can get the info from a chiropractor’s office. I got mine there years ago. I think they are available other places, but for certain the chiropractor’s office would know.
The nextag site has low-cost lumbar support pillows for your car. The comfortchannel site is loaded with different types of supports for your car, but their cost might be prohibitive. I use a small bolster pillow made with those little micro-beads that were so popular. They weren’t very sturdy, so they pretty much aren’t sold anymore. I prefer using it just because is molds to the shape of my back and is cheaper than the ones you can adjust with air. I hope you find one you like. If you have time to go shopping, a lot of family pharmacies sell lumbar support items, as do many chiropractors and massage therapists. I’d be uncomfortable going to a chiropractor or massage therapist if I weren’t a patient, though. (I’m weird that way.)
March 19th, 2010 | 
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Sorry this isn’t a direct answer, but you can get the info from a chiropractor’s office. I got mine there years ago. I think they are available other places, but for certain the chiropractor’s office would know.
The nextag site has low-cost lumbar support pillows for your car. The comfortchannel site is loaded with different types of supports for your car, but their cost might be prohibitive. I use a small bolster pillow made with those little micro-beads that were so popular. They weren’t very sturdy, so they pretty much aren’t sold anymore. I prefer using it just because is molds to the shape of my back and is cheaper than the ones you can adjust with air. I hope you find one you like. If you have time to go shopping, a lot of family pharmacies sell lumbar support items, as do many chiropractors and massage therapists. I’d be uncomfortable going to a chiropractor or massage therapist if I weren’t a patient, though. (I’m weird that way.)