I bought a set of the BIG ones. I believe they're 1 3/4" i.d., and should slip over our pipes, but the heat shields would have to come off.
SOOO..., MY plan, to avoid that, and having to remove the header pipe [(header studs allowing) lol], is to cut them into two halves, drilling and tapping for set-screws, and just installing them over the header pipe without removing sh1t! I believe the oil banjo thingy has to be loosened and rotated counter clockwise to avoid hitting the fins.