This would've been from (https://en.wikipedia.org/wiki/List_of_Webster_episodes#Season_5_(1987%E2%80%9388)) September 21, 1987- (https://www.tvtango.com/series/webster/episodes?page=3)March 10, 1989.

I'll try to put out the exact stations that I could find when I have more time:

Dallas/KTVT: The Super Ones (Ind), Monday, October 12, ... (https://www.radiodiscussions.com/threads/retro-dallas-ktvt-the-super-ones-ind-monday-october-12-1987.658859/)

Retro: Arlington Heights, IL, Thursday, November 5, 1987 (https://www.radiodiscussions.com/threads/retro-arlington-heights-il-thursday-november-5-1987.710373/)

Philadelphia/Pittsburgh - Saturday, December 12, 1987 ... (https://www.radiodiscussions.com/threads/retro-philadelphia-pittsburgh-saturday-december-12-1987-pennsylvania-statehood-bicentennial.762318/)

Retro: Spokane, WA - Sunday, March 13, 1988 (https://www.radiodiscussions.com/threads/retro-spokane-wa-sunday-march-13-1988.634567/)

San Luis Obispo/Morro Bay, CA - January 11, 1988 and 1989 (https://www.radiodiscussions.com/threads/retro-san-luis-obispo-morro-bay-ca-january-11-1988-and-1989.751294/)

Retro: New York City, Wednesday, March 2, 1988 (https://www.radiodiscussions.com/threads/retro-new-york-city-wednesday-march-2-1988.703777/)

Dallas/KTVT: The Super Ones (Ind), Monday, March 14, 1988 (https://www.radiodiscussions.com/threads/retro-dallas-ktvt-the-super-ones-ind-monday-march-14-1988.658857/)

RETRO PROVIDENCE/BOSTON TV- Wednesday April 20 ... (https://www.radiodiscussions.com/threads/retro-providence-boston-tv-wednesday-april-20-1988.494860/)

Des Moines Iowa, Saturday April 23, 1988 (https://www.radiodiscussions.com/threads/des-moines-iowa-saturday-april-23-1988.737409/)

Retro: St. Louis, Wednesday, Jul 20, 1988 (https://www.radiodiscussions.com/threads/retro-st-louis-wednesday-jul-20-1988.727623/)

Retro: Charleston and Columbia, Thursday, August 25, 1988 (https://www.radiodiscussions.com/threads/retro-charleston-and-columbia-thursday-august-25-1988.700498/)

Retro: San Diego - Friday, September 16, 1988 (https://www.radiodiscussions.com/threads/retro-san-diego-friday-september-16-1988.756433/)

Retro: Philadelphia, PA, Monday September 26, 1988 2 ... (https://www.radiodiscussions.com/threads/retro-philadelphia-pa-monday-september-26-1988-2-longtime-independents.686157/)

Retro: Hartford/Springfield Mon, Oct 3, 1988 (https://www.radiodiscussions.com/threads/retro-hartford-springfield-mon-oct-3-1988.612751/)

Retro: South-Central Michigan, Wednesday, 10/05/1988 (https://www.radiodiscussions.com/threads/retro-south-central-michigan-wednesday-10-05-1988.759252/)

Los Angeles/San Diego - Saturday-Monday, November 19- ... (https://www.radiodiscussions.com/threads/retro-los-angeles-san-diego-saturday-monday-november-19-21-1988.752639/)

Retro: Lancaster/Baltimore/DC, Tue. November 22nd, 1988 (https://www.radiodiscussions.com/threads/retro-lancaster-baltimore-dc-tue-november-22nd-1988.658333/)

Wayback: Thanksgiving Weekend (November 24-27), 1988 (https://www.radiodiscussions.com/threads/wayback-thanksgiving-weekend-november-24-27-1988-spokane-washington.664966/)

Retro: Bristol/Knoxville/Lexington (12-12-1988) (https://www.radiodiscussions.com/threads/retro-bristol-knoxville-lexington-12-12-1988.743546/)

Retro: Torrance/Los Angeles, Monday, Dec 19, 1988 (https://www.radiodiscussions.com/threads/retro-torrance-los-angeles-monday-dec-19-1988.722051/)

Retro:Cincinnati, Wednesday, January 4, 1989 (https://www.radiodiscussions.com/threads/retro-cincinnati-wednesday-january-4-1989.611200/)

Retro: Chicago independents, Friday, Feb. 3, 1989 (https://www.radiodiscussions.com/threads/retro-chicago-independents-friday-feb-3-1989.441258/)