I did a bunch of reading here on this topic. Some say it doesn't do any good. Others say it brings the heat up faster. Since I did the EBPV delete I'm seriously considering this.
I did send an email to Alaska Tent and Tarp. Response below on price.

Thanks for inquiring with Alaska Tent & Tarp for your winter front needs.
Cost for an X00373 - F250/350 Winter front: $45.00, one package Z35014 - Screw Studs: $3.75 and $10.80 shipping.
Please contact us if we can be of further assistance.

Thanks


Kelly Dart
Alaska Tent & Tarp
Anchorage Branch Mgr.
100 E Int'l Airport Rd
Anchorage, AK. 99518
Office: (907) 562-2293
Fax: (907) 562-8368
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