Here in US, I've observed the AP Wasp .061 is no longer offered by the various Internet stores. It is no longer listed or is listed as "Out of Stock". The only engine within that class available is the Thunder Tiger GP-07 or the Norvel .074 (http://www.nvengines.com
Since the GP-07 has the same mounting lug spacing as the Norvel .061 and .049 Tee Dee, I was planning to mount it in a Norvel 1 oz (30 cc) RC tank mount. This will require grinding a portion of plastic so the GP-07's lower bulkhead mount tab will clear tank mount.
I plan to use this in my soon to be rebuilt Q-Tee. That should "turbo-charge" it!