Most boosters just sit on the seat and the HBBs are easy to insert the belt into the shoulder piece. We have a couple basic models from Walmart for grandparent cars. We have the Affix which has latch for our cars. We don't give the affix to gparents just because showing them install is a haste and our kids rarely ride with them. But FYI on HBBs that convert to low back is that the base and back on most easily separate. If you go to pick them up from the top the base easily falls off. My mom then can never figure out how to get the two pieces back together.
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Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.