The progressive website shows a Chrome 440 Retrofit Kit, pn 30-5044CC, which appears to be chrome end covers to replace earlier ones (perhaps with aluminum billet covers???).
My new Progressive 440s are due to arrive at the house on Saturday. I ordered the standard spring rate, chrome ones, from MAW.
PS:
After doing a little more research, the ones for about $390 at MAW and Phat Performance Parts are actually with polished aluminum billet caps, not with the chrome caps/covers. MAW doesn't sell the 440s with the chrome (CC) caps, and the 440s at Phat's with the chrome caps are about $135 more expensive. The upgrade chrome caps kit is $110 at Phat's. So, I guess mine will also be the polished aluminum billet capped 440s.