I didn't realize until later that the Rallye 4 harnesses do come in different sizes (I think I read it with the insert I got with mine). So for Sid you might want to specify the size when ordering that harness.
On a side note, I've been a passenger in a vehicle with a Sparco 4 point harness at the track. A total piece of crap b/c the belts kept loosening!
I've also tried a Sparco 5 point harness at the track. That thing felt like I was chained to the seat.