i would get spring air retracts - if you get the 100 series be sure to get the 3/16 strut version. but i would get the 700 series spring air retracts and oleo struts to fit them. this would look great and the oleos would help cushion less than perfect landings, plus the 700 series has sockets for the oleos instead of just holes for wires. the sockets make it much easier to install the oleos.

I wouldn't get the 605 robarts- i have had them and they have plastic frames which break easily and this makes these robarts not worth buying. if you get robarts get their version of spring air retracts - they have a 700 series air up spring down which is like the spring air 100 series.

Mechanical retracts need a retract servo which takes a good retract servo, so when you buy this you end up spending about as much as air retracts. so i perfer air retracts. i have used spring air on my mustangs for almost 10 years now - they are the best retracts you can get for the money.

Ed