FWIW I used the stock retracts for a long time (with old bvm struts), they actually have some nice features, but I did eventually switch to robart. I can't remember which part number but the ones you have listed look right. At the same time I switched I put on some modified prolink trailing link main struts. I used the same bvm wheels and brakes with the trailing link.

I did keep the funkey nose gear though. I ran a twin nosewheel with bvm straight strut