Jimbot58 I believe you're thinking of  Japanese Self-Defence Forces F-15Js used as aggressors representing Red Chinese Su-27s.

Two Bob's has three sheets listed as TB48154, TB48153, and TB48152 in 1/48. I own a copy of TB48154 and it looks like an excellent sheet of decals. However; I didn't see a listing for any of them in 1/72nd though.

All three are listed at the top of the page:

 http://www.flightdecs.ca/A_twobobs_48_scale.htm

Flightdecs Canada is an excellent source. They concentrate on decals and have a number of brands I've never seen before. They don't have a on-line order system though so you'll have to phone them or easier (to me at least) fax them your order and credit card number.

www.flightdecs.ca

If they're out-of-print and you can't find them anywhere I'd look at ebay. You never know what will show up there.

Go to Spruebrothers.com and do a search on the aircraft subject you seek stuff for. Everything they carry for that subject will be displayed...decals included. Sprue Brothers also has a banner ad on the right column of this page.

Ok, I was mistaken as I guess I didn't see those decals for an F-15. I think it was a photo somewhere. I am going to go for the F-16 decals. The question still stands though-best source of after market decals?