Here are three promo 12"s - one of which contains very rare remixes

Ritual (USA)

[Mercury 870 183-1]

Release Date : 1988

a1. Ritual (12"Mix - Extended
      Dido Slam)
a2. Ritual (Dido Dub Mix)
a3. Ritual (A cappella Mix)
b1. Ritual (House Mix -
      Tribal Dub)
b2. World Has A Heart Too
      (Boom Box Jam)

Get To You (USA)

[Mercury PRO 614-1]

Release Date : 1988

a1. Get To You (12" Mix)
a2. Get To You (Dub)
b1. Get To You (12" Mix - by
      Shep Pettibone)
b2. Get To You (Dub - by
      Shep Pettibone)

At first glance, the B-side appears to be the same as the A-side. Closer inspection reveals that the B-side actually contains 2 very rare mixes - 12" and Dub by none other than Shep Pettibone (has mixed Madonna records amongst others). These mixes are quite different to the standard mixes. This promo 12" is the only place that these mixes appear.

Tamin' The Wild Nights (USA)

[Mercury PRO 640-1]

Release Date : 1988

a. Tamin' The Wild Nights
b. Tamin' The Wild Nights